Rosetta Code/Count examples/Full list/Tier 4

From Rosetta Code

Fourth tier of languages sorted by number of examples completed.

See Rosetta_Code/Rank_languages_by_popularity/Full_list for a full language/task completion table.

Top tier Second tier Third tier Fourth tier
Fourth ten programming languages by number of task examples completed:
    ㉛ Scala         ㉜ Delphi        ㉝ Lua           ㉞ XPL0          ㉟ F_Sharp      
    ㊱ PicoLisp      ㊲ AutoHotkey    ㊳ Ring          ㊴ JavaScript    ㊵ Arturo       
As of 2024-06-30T17:58:03Z :: Tasks: 1276 :: Draft Tasks:400 :: Total Tasks: 1676 :: Total Examples: 96809
Count Task
596 Hello world/Text
387 FizzBuzz
382 99 bottles of beer
358 100 doors
310 Comments
310 Factorial
309 Fibonacci sequence
302 A+B
291 Empty program
264 Loops/Infinite
252 Reverse a string
249 Ackermann function
247 Arrays
245 Function definition
241 Loops/For
234 Loops/While
233 Conditional structures
225 Array concatenation
218 Arithmetic/Integer
213 Greatest element of a list
207 Even or odd
207 Greatest common divisor
206 Increment a numerical string
205 Repeat a string
205 Sieve of Eratosthenes
204 Array length
199 Hello world/Graphical
198 Binary digits
198 Towers of Hanoi
197 Averages/Arithmetic mean
195 Copy a string
195 String concatenation
193 Rot-13
191 Loops/Downward for
191 Sum and product of an array
190 Boolean values
189 Integer comparison
188 Character codes
188 Hello world/Newline omission
188 Palindrome detection
187 Apply a callback to an array
187 Integer sequence
186 Loops/For with a specified step
185 String length
183 String case
181 Loops/Foreach
181 Tokenize a string
180 Loops/Break
180 Quine
180 Sum of a series
178 Empty string
175 Sum of squares
174 Filter
174 Logical operations
173 Dot product
172 Hailstone sequence
170 Loops/Do-while
165 Loops/N plus one half
164 Generic swap
163 Associative array/Creation
163 Caesar cipher
162 Sort an integer array
161 Leap year
160 Determine if a string is numeric
160 Luhn test of credit card numbers
157 System time
157 User input/Text
156 Command-line arguments
156 Factors of an integer
156 Generate lower case ASCII alphabet
156 Stack
155 Execute a system command
154 ABC problem
154 Hello world/Standard error
154 Higher-order functions
154 Loops/Continue
154 Zero to the zero power
153 Sorting algorithms/Quicksort
152 Bitwise operations
152 Loop over multiple arrays simultaneously
151 Mutual recursion
150 Guess the number
150 Primality by trial division
150 Sorting algorithms/Bubble sort
149 Read entire file
148 Remove duplicate elements
147 Check that file exists
147 Least common multiple
146 Count in octal
146 Create a file
145 Balanced brackets
145 Roman numerals/Encode
145 Sleep
144 Ethiopian multiplication
144 Happy numbers
143 Mandelbrot set
142 Day of the week
142 File input/output
141 Date format
141 Literals/String
141 Program termination
140 Pascal's triangle
140 Substring
140 Variables
139 Count occurrences of a substring
139 Literals/Integer
139 Strip a set of characters from a string
137 Knuth shuffle
136 Compound data type
136 Function composition
136 N-queens problem
135 Loops/Nested
134 Babbage problem
134 Include a file O
134 Pick random element
134 Sorting algorithms/Insertion sort
134 String matching
133 Letter frequency
132 Align columns
131 Averages/Median
131 Detect division by zero
131 Look-and-say sequence
131 Matrix transposition
131 Null object
130 File size
130 Read a file line by line
130 String append
129 Anagrams
129 Averages/Root mean square
129 Binary search
129 Flatten a list
129 Return multiple values
128 Associative array/Iteration
128 Hash from two arrays
128 Matrix multiplication
127 Conway's Game of Life
127 Delete a file
127 Guess the number/With feedback
127 Identity matrix
126 Perfect numbers
125 Find limit of recursion
125 Harshad or Niven series
125 Input loop
125 Roman numerals/Decode
124 Haversine formula
124 Levenshtein distance
123 Call a function
123 Case-sensitivity of identifiers
123 Environment variables
123 Sierpinski triangle
122 Assertions
122 Classes
122 Comma quibbling
122 Real constants and functions
122 String interpolation (included)
121 Run-length encoding
121 Substring/Top and tail
121 Variadic function
120 Bulls and cows
120 Pangram checker
120 Search a list
119 Arithmetic/Complex
119 Ordered words
119 Rename a file
119 Sum multiples of 3 and 5
118 Formatted numeric output
118 HTTP
118 Reverse words in a string
118 Strip whitespace from a string/Top and tail
117 Create a two-dimensional array at runtime
117 Horner's rule for polynomial evaluation
117 Infinity
117 Multiplication tables
117 The Twelve Days of Christmas
116 Accumulator factory
116 Averages/Pythagorean means
116 Evaluate binomial coefficients
116 Sum digits of an integer
115 Hostname
115 Permutations
115 Program name
115 Temperature conversion
114 Anonymous recursion
114 Sequence of non-squares
114 String prepend
114 Zig-zag matrix
113 Combinations
113 Digital root
113 Sorting algorithms/Merge sort
112 24 game
112 Calculating the value of e
112 Middle three digits
112 Queue/Definition
112 Trigonometric functions
111 Amicable pairs
111 Catalan numbers
111 Exceptions
111 Random numbers
110 Vector products
109 Abundant, deficient and perfect number classifications
109 Evolutionary algorithm
109 Prime decomposition
109 Shell one-liner O
109 Time a function
108 Arbitrary-precision integers (included) O
108 Arithmetic-geometric mean
108 Short-circuit evaluation
107 Enumerations
107 Hello world/Newbie
107 Symmetric difference
106 Regular expressions
106 Show ASCII table
105 N'th
105 Tree traversal
104 Power set
104 Sorting algorithms/Selection sort
104 Walk a directory/Non-recursively
103 Averages/Mode
103 Collections
103 Floyd's triangle
103 Hofstadter Q sequence
102 Exponentiation operator
102 Hamming numbers
102 Map range
101 Create an HTML table
101 Execute Brain****
101 Interactive programming (repl) O O
101 Nth root
101 Range expansion
101 Sort using a custom comparator
101 Y combinator
100 Entropy
100 String comparison
99 First-class functions
99 MD5
99 Modular inverse
99 Number reversal game
99 Sorting algorithms/Cocktail sort
98 Address of a variable O
98 Catamorphism
98 Gray code
98 Langton's ant
98 Random number generator (included)
98 Sorting algorithms/Bogosort
98 Split a character string based on change of character
97 Compare a list of strings
97 Range extraction
97 Repeat
97 Sierpinski carpet
97 Sorting algorithms/Heapsort
96 CSV data manipulation
96 Forward difference
96 Inheritance/Single
96 Last Friday of each month
96 Menu
96 Monty Hall problem
96 One-dimensional cellular automata
96 Sorting algorithms/Gnome sort
96 Terminal control/Clear the screen
95 Abstract type O
95 Averages/Simple moving average
95 JSON
95 Number names
94 Almost prime
94 Anti-primes
94 Cumulative standard deviation
94 Greatest subsequential sum
94 Munchausen numbers
94 Simple windowed application
93 Additive primes
93 Box the compass
93 Count in factors
93 Five weekends
93 Literals/Floating point
93 Population count
92 Department numbers
92 Multifactorial
92 Non-decimal radices/Convert
91 CSV to HTML translation
91 Count the coins
91 Hello world/Line printer
91 Queue/Usage
91 Set
91 URL decoding
91 Window creation
91 Word wrap
90 Find common directory path
90 Find the last Sunday of each month
90 Long multiplication
90 Operator precedence
90 Order two numerical lists
90 Playing cards
90 Sort an array of composite structures
90 Strip comments from a string
90 Thue-Morse
90 Top rank per group
89 100 prisoners
89 CRC-32
89 Price fraction
89 SEDOLs
89 Terminal control/Ringing the terminal bell
89 Walk a directory/Recursively
88 Benford's law
88 Bitmap
88 Closures/Value capture
88 Here document O
88 Josephus problem
88 Proper divisors
88 Read a specific line from a file
88 URL encoding
87 15 puzzle game
87 Introspection
87 Jump anywhere O
87 Pi
86 Angle difference between two bearings
86 Attractive numbers
86 Call an object method
86 Convert seconds to compound duration
86 Dynamic variable names
86 File modification time
86 Find the missing permutation
86 Knapsack problem/0-1
86 Lucas-Lehmer test
86 Pythagorean triples
86 Singly-linked list/Traversal
86 Sorting algorithms/Shell sort
86 Spiral matrix
86 Take notes on the command line
86 XML/Input
85 Extend your language
85 Priority queue
85 Rep-string
85 Show the epoch O
85 Sorting algorithms/Counting sort
84 Fibonacci n-step number sequences
84 Kaprekar numbers
84 Monte Carlo methods
84 Sequence of primes by trial division
84 Sockets
83 Concurrent computing
83 Date manipulation
83 Dragon curve
83 Gamma function
83 Keyboard input/Obtain a Y or N response
83 Linear congruential generator
83 Man or boy test
83 Old lady swallowed a fly
83 Pernicious numbers
83 Sort disjoint sublist
83 Soundex
83 Special characters
83 Unicode variable names
83 Write entire file
82 Animation
82 Calendar
82 Call a foreign-language function
82 Currying
82 Equilibrium index
82 Jewels and stones
82 Quaternion type
82 Semordnilap
82 Singly-linked list/Element definition
82 Sorting algorithms/Comb sort
82 Web scraping
81 Anagrams/Deranged anagrams
81 Empty directory
81 Flow-control structures
81 Jensen's Device
81 List comprehensions
81 Rock-paper-scissors
81 Vigenère cipher
81 Zeckendorf number representation
80 AKS test for primes
80 Averages/Mean angle
80 Euler method
80 Exponentiation order
80 Fractal tree
80 General FizzBuzz
80 Guess the number/With feedback (player)
80 ISBN13 check digit
80 Narcissistic decimal number
80 Sort three variables
80 Sudoku
79 Chinese remainder theorem
79 Draw a sphere
79 Four bit adder
79 Hello world/Web server
79 Maze generation
79 McNuggets problem
79 Non-decimal radices/Output
79 SHA-1
79 Square but not cube
79 Van Eck sequence
78 Damm algorithm
78 Execute HQ9+
78 I before E except after C
78 Largest int from concatenated ints
78 Read a configuration file
78 Semiprime
78 Stern-Brocot sequence
78 Trabb Pardo–Knuth algorithm
77 Bitmap/Bresenham's line algorithm
77 Catalan numbers/Pascal's triangle
77 Enforced immutability
77 Phrase reversals
77 Roots of unity
77 Self-describing numbers
77 Sorting algorithms/Stooge sort
77 Stair-climbing puzzle
77 Unix/ls
77 Van der Corput sequence
77 Write float arrays to a text file
77 Yin and yang
76 Combinations with repetitions
76 Exceptions/Catch an exception thrown in a nested call
76 Multiple distinct objects
76 Special variables
76 Strip control codes and extended characters from a string
75 Constrained random points on a circle
75 Magic 8-ball
75 Parsing/RPN calculator algorithm
75 SHA-256
75 Tau function
74 4-rings or 4-squares puzzle
74 Amb
74 Barnsley fern
74 Continued fraction
74 Determine if a string is collapsible
74 Longest common subsequence
74 Nested function
74 Numerical integration
74 Polymorphism
74 Runtime evaluation
73 Closest-pair problem
73 Dutch national flag problem
73 IBAN
73 Isqrt (integer square root) of X
73 Magic squares of odd order
73 Named parameters
73 Probabilistic choice
73 RPG attributes generator
73 Smith numbers
73 Sorting algorithms/Pancake sort
73 Variable size/Get O
73 Word frequency
72 Abundant odd numbers
72 Arithmetic/Rational
72 Compile-time calculation O O
72 Draw a cuboid
72 Extract file extension
72 Fast Fourier transform
72 Get system command output
72 Leonardo numbers
72 Morse code
72 Singly-linked list/Element insertion
72 Subleq
72 Text processing/Max licenses in use
72 Two sum
71 Best shuffle
71 Cartesian product of two or more lists
71 Chinese zodiac
71 Circles of given radius through two points
71 Disarium numbers
71 Euler's sum of powers conjecture
71 Memory allocation O
71 Modular exponentiation
71 One of n lines in a file
71 Primality by Wilson's theorem
71 Remove lines from a file
71 Roots of a function
71 Two identical strings
70 Base64 decode data
70 Binary strings
70 Determine if a string has all the same characters
70 Emirp primes
70 Factors of a Mersenne number
70 Host introspection O
70 Long year
70 Reduced row echelon form
70 Remove vowels from a string
70 Sort stability
70 Write language name in 3D ASCII
69 9 billion names of God the integer
69 Animate a pendulum
69 Arithmetic evaluation
69 CUSIP
69 Cholesky decomposition
69 Documentation
69 Draw a clock
69 Draw a pixel
69 Fork O
69 Integer overflow
69 Mouse position
69 Non-decimal radices/Input
69 Runge-Kutta method
69 Tau number
69 Test a function
69 Tic-tac-toe
69 Undefined values
69 XML/Output
68 Averages/Mean time of day
68 Base64 encode data
68 Hofstadter-Conway $10,000 sequence
68 Longest common prefix
68 Longest common substring
68 Miller–Rabin primality test
68 Plot coordinate pairs
68 Roots of a quadratic function
68 Sorting algorithms/Sleep sort
67 Cantor set
67 Copy stdin to stdout
67 FASTA format
67 Globally replace text in several files
67 HTTPS
67 Inheritance/Multiple O
67 Optional parameters
67 Pascal matrix generation
67 Quickselect algorithm
67 Terminal control/Display an extended character
67 Ternary logic
67 Vector
66 2048
66 Farey sequence
66 Gapful numbers
66 Knight's tour
66 Ludic numbers
66 Maximum triangle path sum
66 Totient function
66 Truncatable primes
66 Unicode strings
65 Bitmap/Write a PPM file
65 JortSort
65 Knapsack problem/Continuous
65 Knapsack problem/Unbounded
65 Loops/Increment loop index within loop body
65 Smallest square that begins with n
64 24 game/Solve
64 Add a variable to a class instance at runtime O O
64 Brownian tree
64 Code Golf: Code Golf
64 DNS query
64 Days between dates
64 Discordian date
64 Fibonacci word
64 Fusc sequence
64 Generator/Exponential
64 Huffman coding
64 Nim game
64 Sum of first n cubes
63 Archimedean spiral
63 Convert decimal number to rational
63 Dinesman's multiple-dwelling problem
63 Horizontal sundial calculations
63 Left factorials
63 Odd word problem
63 Partial function application
63 Random number generator (device)
63 Sattolo cycle
63 Scope modifiers
63 Sum of divisors
63 Terminal control/Coloured text
63 Truncate a file
63 Validate International Securities Identification Number
62 Deal cards for FreeCell
62 Define a primitive data type
62 Dijkstra's algorithm
62 Doubly-linked list/Element definition
62 Find the intersection of two lines
62 Grayscale image
62 Iterated digits squaring
62 Kernighans large earthquake problem
62 LZW compression
62 Loops/With multiple ranges
62 Mad Libs
62 Matrix-exponentiation operator
62 Pointers and references O
62 Sort numbers lexicographically
62 Stem-and-leaf plot
61 Abbreviations, automatic
61 Extreme floating point values
61 Hash join
61 Largest proper divisor of n
61 Multisplit
61 Pig the dice game
61 Sorting algorithms/Bead sort
61 Sorting algorithms/Permutation sort
61 Topological sort
61 Unbias a random generator
61 User input/Graphical
61 Words containing "the" substring
60 Bell numbers
60 Bernoulli numbers
60 Compare length of two strings
60 Forest fire
60 Inverted syntax O O O
60 Keyboard input/Keypress check
60 Password generator
60 Perfect shuffle
60 Runtime evaluation/In an environment
60 Shoelace formula for polygonal area
60 Sierpinski triangle/Graphical
60 Singleton
60 Tokenize a string with escaping
59 Call a function in a shared library
59 Chaos game
59 Delegates
59 First-class functions/Use numbers analogously
59 Holidays related to Easter
59 Kronecker product
59 Perfect totient numbers
59 Rosetta Code/Rank languages by popularity
59 Stack traces
59 Universal Turing machine
59 Water collected between towers
58 Egyptian division
58 Halt and catch fire
58 Handle a signal
58 Hofstadter Figure-Figure sequences
58 Modulinos
58 Rate counter
58 Recaman's sequence
58 Search a list of records
58 Seven-sided dice from five-sided dice
58 Statistics/Basic
58 Strange plus numbers
58 Wireworld
58 XML/XPath
57 Associative array/Merging
57 Bioinformatics/base count
57 Determine if a string has all unique characters
57 Fractran
57 Generate Chess960 starting position
57 Heronian triangles
57 Longest string challenge
57 Naming conventions
57 Non-continuous subsequences
57 Polynomial regression
57 Strip block comments
57 XML/DOM serialization
56 Extensible prime generator
56 Gaussian elimination
56 Jaro similarity
56 Longest increasing subsequence
56 Move-to-front algorithm
56 Send email O
56 Set consolidation
56 Sum of the digits of n is substring of n
56 Terminal control/Cursor positioning
56 Ulam spiral (for primes)
55 Average loop length
55 Casting out nines
55 Doubly-linked list/Element insertion
55 Execute a Markov algorithm
55 Mertens function
55 Munching squares
55 Odd and square numbers
55 Spinning rod animation/Text
55 Synchronous concurrency
55 Text between
55 Text processing/2
54 21 game
54 Aliquot sequence classifications
54 Convex hull
54 Determinant and permanent
54 Determine if a string is squeezable
54 Digital root/Multiplicative digital root
54 Doubly-linked list/Traversal
54 Elementary cellular automaton
54 Greyscale bars/Display
54 Hilbert curve
54 Idiomatically determine all the lowercase and uppercase letters
54 Matrix with two diagonals
54 Musical scale
54 Substitution cipher
54 The Name Game
54 Zebra puzzle
53 Append a record to the end of a text file
53 Chowla numbers
53 Currency
53 Dining philosophers
53 Image noise
53 MAC vendor lookup
53 Make directory path
53 Numbers divisible by their individual digits, but not by the product of their digits.
52 ABC words
52 Doubly-linked list/Definition
52 Find words which contains more than 3 e vowels
52 Floyd-Warshall algorithm
52 GUI component interaction
52 Metaprogramming O
52 Polynomial long division
52 Problem of Apollonius
52 Respond to an unknown method call O
52 Stable marriage problem
52 Start from a main routine O
52 Strange numbers
52 Taxicab numbers
52 Text processing/1
52 Verify distribution uniformity/Naive
51 Abbreviations, easy
51 Bitmap/Flood fill
51 Colour bars/Display
51 Colour pinstripe/Display
51 Combinations and permutations
51 History variables
51 Last letter-first letter
51 Permutations/Derangements
51 Polymorphic copy
51 Send an unknown method call
51 Variable size/Set O
50 Approximate equality
50 Bitmap/Midpoint circle algorithm
50 Bitmap/Read a PPM file
50 Brazilian numbers
50 Coprimes
50 Flipping bits game
50 Humble numbers
50 Lah numbers
50 Nice primes
50 Permutations by swapping
50 Sequence: smallest number with exactly n divisors
50 Sorting Algorithms/Circle Sort
50 Sorting algorithms/Radix sort
50 Sparkline in unicode
50 Special divisors
50 Sum to 100
50 Twelve statements
50 UTF-8 encode and decode
50 Visualize a tree
50 Yellowstone sequence
49 10001th prime
49 Active object
49 Bulls and cows/Player
49 Continued fraction/Arithmetic/Construct from rational number
49 Deepcopy
49 Display a linear combination
49 Element-wise operations
49 File extension is in extensions list
49 Find prime n such that reversed n is also prime
49 Find square difference
49 Loops/Wrong ranges
49 Magnanimous numbers
49 Narcissist
49 OpenGL
49 Parsing/Shunting-yard algorithm
49 Product of divisors
49 Shift list elements to left by 3
49 Show the (decimal) value of a number of 1s appended with a 3, then squared
49 Steady squares
48 Ascending primes
48 Balanced ternary
48 Color of a screen pixel
48 Count how many vowels and consonants occur in a string
48 Determine if only one instance is running
48 Feigenbaum constant calculation
48 Find words which contains all the vowels
48 Fivenum
48 GUI/Maximum window dimensions
48 Golden ratio/Convergence
48 Input/Output for pairs of numbers
48 Julia set
48 Long primes
48 Mersenne primes
48 Palindrome dates
48 Pseudo-random numbers/Middle-square method
48 Secure temporary file
48 Speech synthesis
48 Subtractive generator
48 Sudan function
48 Terminal control/Dimensions
48 Truth table
47 Base 16 numbers needing a to f
47 Echo server
47 Extra primes
47 Factorions
47 Keyboard input/Flush the keyboard buffer
47 Knapsack problem/Bounded
47 Largest number divisible by its digits
47 Pythagorean quadruples
47 Sailors, coconuts and a monkey problem
47 Scope/Function names and labels
47 Sort a list of object identifiers
47 Sutherland-Hodgman polygon clipping
47 Table creation/Postal addresses
47 Triplet of three numbers
47 Type detection
47 Unique characters
46 Abbreviations, simple
46 Arithmetic numbers
46 Arithmetic-geometric mean/Calculate Pi
46 Atomic updates O
46 Brace expansion
46 Carmichael 3 strong pseudoprimes
46 Compiler/lexical analyzer
46 Find prime numbers of the form n*n*n+2
46 Find the intersection of a line with a plane
46 Hickerson series of almost integers
46 Integer roots
46 Koch curve
46 Pascal's triangle/Puzzle
46 Permutations with repetitions
46 Primorial numbers
46 Read a file character by character/UTF8
46 Rosetta Code/Count examples
46 Safe primes and unsafe primes
46 Sequence: smallest number greater than previous term with exactly n divisors
46 Sorting algorithms/Patience sort
46 Terminal control/Hiding the cursor
45 Cheryl's birthday
45 Church numerals
45 Cramer's rule
45 Cycle detection
45 Digit fifth powers
45 Eban numbers
45 Euler's identity
45 Fairshare between two and more
45 Find squares n where n+1 is prime
45 First 9 prime Fibonacci number
45 Four is magic
45 Frobenius numbers
45 MD5/Implementation
45 Numerical integration/Adaptive Simpson's method
45 Primes whose sum of digits is 25
45 Ranking methods
45 S-expressions
45 Solve the no connection puzzle
45 Sorting algorithms/Strand sort
45 Sum of elements below main diagonal of matrix
45 Variable-length quantity
45 Voronoi diagram
44 Chaocipher
44 Cuban primes
44 Find words whose first and last three letters are equal
44 Function prototype O O
44 Implicit type conversion
44 Input/Output for lines of text
44 Kahan summation
44 Magic squares of doubly even order
44 Modular arithmetic
44 Numbers with prime digits whose sum is 13
44 Partition an integer x into n primes
44 Penney's game
44 Percentage difference between images
44 Prime conspiracy
44 Sort the letters of string in alphabetical order
44 Summarize and say sequence
44 Terminal control/Inverse video
44 Test integerness
44 Topswops
44 Vampire number
43 Bitwise IO
43 Calendar - for "REAL" programmers
43 Cousin primes
43 Find palindromic numbers in both binary and ternary bases
43 GUI enabling/disabling of controls
43 Inverted index
43 Knuth's algorithm S
43 Maze solving
43 Metronome
43 Multiple regression
43 Parallel calculations O
43 Parametric polymorphism O
43 Pathological floating point problems
43 Pythagoras tree
43 Ray-casting algorithm
43 Statistics/Normal distribution
43 Xiaolin Wu's line algorithm
42 Bitmap/Bézier curves/Cubic
42 Circular primes
42 Dice game probabilities
42 Fibonacci word/fractal
42 Find words with alternating vowels and consonants
42 Length of an arc between two angles
42 Longest common suffix
42 Multi-dimensional array O
42 Numbers in base-16 representation that cannot be written with decimal digits
42 Numbers whose binary and ternary digit sums are prime
42 Numbers with same digit set in base 10 and base 16
42 Old Russian measure of length
42 Permutation test
42 Pinstripe/Display
42 Poker hand analyser
42 QR decomposition
42 Rosetta Code/Find bare lang tags
42 Strange unique prime triplets
41 Abelian sandpile model
41 Alternade words
41 Apply a digital filter (direct form II transposed)
41 Canonicalize CIDR
41 Check output device is a terminal
41 Constrained genericity O O
41 Create a file on magnetic tape
41 Determine if two triangles overlap
41 Diversity prediction theorem
41 Draw a rotating cube
41 Entropy/Narcissist
41 Events
41 Find minimum number of coins that make a given value
41 Harmonic series
41 LU decomposition
41 Lychrel numbers
41 Machine code
41 Metered concurrency
41 Minimum multiple of m where digital sum equals m
41 Minimum number of cells after, before, above and below NxN squares
41 Möbius function
41 Numerical integration/Gauss-Legendre Quadrature
41 O'Halloran numbers
41 Parsing/RPN to infix conversion
41 Perlin noise
41 Positive decimal integers with the digit 1 occurring exactly twice
41 Smarandache prime-digital sequence
41 Square-free integers
41 Successive prime differences
41 Word wheel
40 AVL tree
40 Break OO privacy
40 Calkin-Wilf sequence
40 Change e letters to i in words
40 Common list elements
40 Create an object at a given address O
40 Deceptive numbers
40 Doomsday rule
40 Find first missing positive
40 Find if a point is within a triangle
40 First power of 2 that has leading decimal digits of 12
40 Maximum difference between adjacent elements of list
40 Mosaic matrix
40 Motzkin numbers
40 Negative base numbers
40 Neighbour primes
40 Numbers in base 10 that are palindromic in bases 2, 4, and 16
40 Numbers with equal rises and falls
40 Object serialization
40 Polyspiral
40 Set puzzle
40 Strong and weak primes
40 Subset sum problem
40 Summarize primes
40 Unique characters in each string
40 Zumkeller numbers
39 Algebraic data types
39 Angles (geometric), normalization and conversion
39 Append numbers at same position in strings
39 Bitmap/Bézier curves/Quadratic
39 Common sorted list
39 Conjugate transpose
39 Esthetic numbers
39 Find first and last set bit of a long integer
39 Gauss-Jordan matrix inversion
39 Jacobi symbol
39 Minesweeper game
39 Multiline shebang
39 Mutex
39 Order disjoint list items
39 Parse command-line arguments
39 Peano curve
39 Pragmatic directives
39 RIPEMD-160
39 RSA code
39 Safe and Sophie Germain primes
39 Sorting algorithms/Cycle sort
39 Superellipse
39 Terminal control/Unicode output
39 Textonyms
39 Twin primes
38 Bin given limits
38 Burrows–Wheeler transform
38 Color wheel
38 Erdős-primes
38 Faulhaber's triangle
38 First perfect square in base n with n unique digits
38 Four sides of square
38 Greedy algorithm for Egyptian fractions
38 Jacobsthal numbers
38 MD4
38 Minimum numbers of three lists
38 Ordered partitions
38 Padovan sequence
38 Pentagram
38 Solve a Hidato puzzle
38 Sum and product puzzle
38 Terminal control/Cursor movement
38 Weird numbers
37 Bacon cipher
37 Biorhythms
37 Death Star
37 Decimal floating point number to binary
37 Find words which contain the most consonants
37 Galton box animation
37 Generate random numbers without repeating a value
37 Giuga numbers
37 Mayan numerals
37 Next highest int from digits
37 Pell's equation
37 Primes with digits in nondecreasing order
37 Product of min and max prime factors
37 Pseudo-random numbers/PCG32
37 Ramer-Douglas-Peucker line simplification
37 Reflection/List properties
37 Rosetta Code/Find unimplemented tasks
37 Sexy primes
37 Sylvester's sequence
37 Terminal control/Preserve screen
37 Wieferich primes
37 Words from neighbour ones
36 Chebyshev coefficients
36 Chemical calculator
36 Cullen and Woodall numbers
36 Day of the week of Christmas and New Year
36 Deconvolution/1D
36 Descending primes
36 Euler's constant 0.5772...
36 Exactly three adjacent 3 in lists
36 Faulhaber's formula
36 Largest prime factor
36 Law of cosines - triples
36 Long literals, with continuations
36 Mian-Chowla sequence
36 Numbers which are the cube roots of the product of their proper divisors
36 Partition function P
36 Random Latin squares
36 Simple database
36 Sleeping Beauty problem
36 Super-d numbers
36 Topic variable O
36 URL parser
36 Write to Windows event log
35 Bitmap/Histogram
35 Check input device is a terminal
35 Decision tables
35 Distinct power numbers
35 FTP
35 Increasing gaps between consecutive Niven numbers
35 Klarner-Rado sequence
35 Memory layout of a data structure O
35 Mind boggling card trick
35 Minimum positive multiple in base 10 using only 0 and 1
35 Monads/Maybe monad
35 Multiplicative order
35 Odd squarefree semiprimes
35 Odd words
35 Parallel brute force
35 Parameterized SQL statement
35 Pierpont primes
35 Prime numbers which contain 123
35 Resistor mesh
35 Set of real numbers
35 Sierpinski arrowhead curve
35 Stirling numbers of the first kind
35 Stirling numbers of the second kind
35 Straddling checkerboard
35 Summation of primes
35 Unprimeable numbers
35 Use another language to call a function
35 Verify distribution uniformity/Chi-squared test
35 Window creation/X11 O
35 Word break problem
34 Bioinformatics/Sequence mutation
34 Bitcoin/address validation
34 Deming's funnel
34 Duffinian numbers
34 Executable library
34 Execute SNUSP
34 Finite state machine
34 Honaker primes
34 Hunt the Wumpus
34 Kronecker product based fractals
34 Largest five adjacent number
34 Last list item
34 N-smooth numbers
34 Palindromic primes
34 Piprimes
34 Prime triplets
34 Range consolidation
34 Riordan numbers
34 Selectively replace multiple instances of a character within a string
34 Sierpinski pentagon
34 Sum of primes in odd positions is prime
34 Sum of square and cube digits of an integer are primes
34 Total circles area
34 Video display modes
34 Zhang-Suen thinning algorithm
33 Almkvist-Giullera formula for pi
33 Checkpoint synchronization
33 Cistercian numerals
33 Compiler/virtual machine interpreter
33 Concatenate two primes is also prime
33 Curzon numbers
33 Cut a rectangle
33 De Bruijn sequences
33 First class environments
33 Generate random chess position
33 Go Fish
33 HTTPS/Authenticated
33 Idiomatically determine all the characters that can be used for symbols
33 Legendre prime counting function
33 Nonoblock
33 Plasma effect
33 Reflection/List methods
33 Sorting algorithms/Cocktail sort with shifting bounds
32 Arena storage pool
32 Changeable words
32 Chat server O
32 Factorial primes
32 Fermat numbers
32 Honeycombs
32 Keyboard macros
32 Merge and aggregate datasets
32 Numbers whose count of divisors is prime
32 Numeric error propagation
32 Own digits power sum
32 Ramsey's theorem
32 Reverse the order of lines in a text file while preserving the contents of each line
32 Rosetta Code/Fix code tags
32 Smallest multiple
32 Special neighbor primes
32 State name puzzle
32 Stream merge
32 Sunflower fractal
32 Table creation
31 A* search algorithm
31 Anadromes
31 Birthday problem
31 Check Machin-like formulas
31 Collect and sort square numbers in ascending order from three lists
31 Cyclops numbers
31 De Polignac numbers
31 Euclidean rhythm
31 Find adjacent primes which differ by a square integer
31 Formal power series
31 Idoneal numbers
31 Monads/List monad
31 Numeric separator syntax
31 Palindromic gapful numbers
31 Play recorded sounds
31 Prime words
31 Pseudo-random numbers/Splitmix64
31 Quadrat special primes
31 Safe addition
31 Shortest common supersequence
31 Snake and ladder
31 Spelling of ordinal numbers
31 Teacup rim text
31 The ISAAC cipher
31 Thiele's interpolation formula
31 Tonelli-Shanks algorithm
31 Ulam numbers
31 Update a configuration file
31 Wordle comparison
30 Active Directory/Connect
30 Audio alarm
30 Consecutive primes with ascending or descending differences
30 Decorate-sort-undecorate idiom
30 Determine sentence type
30 Find largest left truncatable prime in a given base
30 Fixed length records
30 Function frequency
30 Longest substrings without repeating characters
30 Magic constant
30 Magic squares of singly even order
30 N-grams
30 Natural sorting
30 Next special primes
30 Orbital elements
30 Order by pair comparisons
30 Percolation/Mean run density
30 Same fringe
30 Smallest power of 6 whose decimal expansion contains n
30 Solve a Holy Knight's tour
30 Sum of two adjacent numbers are primes
30 Superpermutation minimisation
30 Two's complement
30 UPC
29 15 puzzle solver
29 Base58Check encoding
29 Brilliant numbers
29 Calmo numbers
29 Card shuffles
29 Continued fraction/Arithmetic/G(matrix ng, continued fraction n)
29 Coprime triplets
29 Cubic special primes
29 EKG sequence convergence
29 Exponentiation with infix operators in (or operating on) the base
29 Fraction reduction
29 Hex words
29 Intersecting number wheels
29 Largest difference between adjacent primes
29 Levenshtein distance/Alignment
29 Make a backup file
29 Matrix chain multiplication
29 Nautical bell
29 Padovan n-step number sequences
29 Palindromic primes in base 16
29 Paraffins
29 Parse an IP Address
29 Permutations/Rank of a permutation
29 Permuted multiples
29 Primes which contain only one odd digit
29 Primes whose first and last number is 3
29 Rare numbers
29 Record sound
29 Self numbers
29 Sequence of primorial primes
29 Soloway's recurring rainfall
29 Solve a Numbrix puzzle
29 Sort primes from list to a list
29 Welch's t-test
29 Wilson primes of order n
29 World Cup group stage
28 Abelian sandpile model/Identity
28 Achilles numbers
28 Blum integer
28 Camel case and snake case
28 Cipolla's algorithm
28 Colorful numbers
28 Distributed programming
28 Elementary cellular automaton/Random number generator
28 Elliptic curve arithmetic
28 Euclid-Mullin sequence
28 File size distribution
28 Getting the number of decimal places
28 Image convolution
28 K-means++ clustering
28 Linux CPU utilization
28 Lucky and even lucky numbers
28 Playfair cipher
28 Print itself O
28 Pseudo-random numbers/Xorshift star
28 Round-robin tournament schedule
28 Snake
28 The sieve of Sundaram
28 Wagstaff primes
28 Yahoo! search interface
27 ASCII art diagram converter
27 Commatizing numbers
27 Composite numbers k with no single digit factors whose factors are all substrings of k
27 Kolakoski sequence
27 Kosaraju
27 Largest product in a grid
27 Main step of GOST 28147-89
27 Markov chain text generator
27 Pisano period
27 RCRPG
27 Reverse the gender of a string
27 Sierpinski curve
27 Simulate input/Keyboard
27 Solve triangle solitaire puzzle
27 Special factorials
27 Sum data type
27 Zeckendorf arithmetic
26 Assertions in design by contract
26 Goldbach's comet
26 Hough transform
26 Inconsummate numbers in base 10
26 Index finite lists of positive integers
26 List rooted trees
26 Mastermind
26 Modified random distribution
26 Monads/Writer monad
26 N-body problem
26 Nested templated data
26 Ormiston pairs
26 Pancake numbers
26 Periodic table
26 Prime numbers p for which the sum of primes less than or equal to p is prime
26 Print debugging statement
26 Radical of an integer
26 Sierpinski square curve
26 Sine wave
26 Sphenic numbers
26 Substring primes
26 Variable declaration reset
25 Active Directory/Search for a user
25 Arithmetic derivative
25 Conjugate a Latin verb
25 Continued fraction/Arithmetic/G(matrix ng, continued fraction n1, continued fraction n2)
25 Eertree
25 Find duplicate files
25 Joystick position
25 Matrix digital rain
25 Median filter
25 Metallic ratios
25 Minimum primes
25 Native shebang
25 Pandigital prime
25 Perceptron
25 Permutations with some identical elements
25 Practical numbers
25 Quoting constructs
25 Reflection/Get source
25 SOAP
25 Sequence: nth number with exactly n divisors
25 Set right-adjacent bits
25 Solve a Hopido puzzle
25 Untrusted environment
25 Vibrating rectangles
24 Addition chains
24 Air mass
24 Bilinear interpolation
24 Bitcoin/public point to address
24 Compiler/code generator
24 Compiler/syntax analyzer
24 Create an object/Native demonstration O
24 Double Twin Primes
24 Erdős-Nicolas numbers
24 Juggler sequence
24 K-d tree
24 Largest palindrome product
24 Line circle intersection
24 Meissel–Mertens constant
24 Numbers which are not the sum of distinct squares
24 Peaceful chess queen armies
24 Pig the dice game/Player
24 Polynomial synthetic division
24 Singly-linked list/Element removal
24 Smallest numbers
24 Sokoban
24 Special pythagorean triplet
24 Vigenère cipher/Cryptanalysis
23 Bifid cipher
23 Draw pixel 2
23 Elementary cellular automaton/Infinite length
23 Fortunate numbers
23 Jordan-Pólya numbers
23 Knuth's power tree
23 Latin Squares in reduced form
23 Long stairs
23 Montgomery reduction
23 Names to numbers
23 Nonogram solver
23 Pairs with common factors
23 Percolation/Site percolation
23 Pseudo-random numbers/Combined recursive generator MRG32k3a
23 Sub-unit squares
23 Two bullet roulette
23 Useless instructions
23 Vogel's approximation method
22 Compare sorting algorithms' performance
22 Cyclotomic polynomial
22 Data Encryption Standard
22 Equal prime and composite sums
22 Iccanobif primes
22 Imaginary base numbers
22 Logistic curve fitting in epidemiology
22 Nimber arithmetic
22 Percolation/Mean cluster density
22 Primes - allocate descendants to their ancestors
22 Rhonda numbers
22 Ruth-Aaron numbers
22 Safe mode
22 Selective file copy
22 Self-hosting compiler
22 Separate the house number from the street name
22 Simulate input/Mouse
22 Tarjan
22 Window management
22 Word ladder
21 Arithmetic coding/As a generalized change of radix
21 Aspect oriented programming
21 Bézier curves/Intersections
21 Color quantization
21 Curve that touches three points
21 Distribution of 0 digits in factorial series
21 HTTPS/Client-authenticated
21 Jaro-Winkler distance
21 Just in time processing on a character stream
21 Longest palindromic substrings
21 Minimal steps down to 1
21 Multiplicatively perfect numbers
21 P-value correction
21 Pell numbers
21 Penrose tiling
21 Pseudorandom number generator image
21 Readline interface
21 Repunit primes
21 Simulated annealing
21 Transportation problem
21 Tree from nesting levels
21 Ultra useful primes
21 Upside-down numbers
21 XML validation
21 XXXX redacted
20 Bitmap/Read an image through a pipe
20 Code segment unload
20 Compiler/AST interpreter
20 Execute Computer/Zero
20 Most frequent k chars distance
20 OpenWebNet password
20 Ormiston triples
20 Penta-power prime seeds
20 Prime triangle
20 Primes: n*2^m+1
20 Proof O
20 Retrieve and search chat history
20 SEND + MORE = MONEY
20 SQL-based authentication
20 Square root by hand
20 Steffensen's method
20 Terminal control/Positional read
20 Three word location
20 Wolstenholme numbers
19 Banker's algorithm
19 Bernstein basis polynomials
19 Bitmap/PPM conversion through a pipe
19 CalmoSoft primes
19 Chernick's Carmichael numbers
19 Earliest difference between prime gaps
19 Extreme primes
19 Find URI in text
19 Forbidden numbers
19 Free polyominoes enumeration
19 Geohash
19 Gradient descent
19 Home primes
19 Minkowski question-mark function
19 Percolation/Bond percolation
19 Quad-power prime seeds
19 SHA-256 Merkle tree
19 Solve hanging lantern problem
19 VList
19 War card game
19 Word search
19 Zsigmondy numbers
18 Audio frequency generator O
18 Binary coded decimal
18 Bioinformatics/Subsequence
18 Centre and radius of a circle passing through 3 points in a plane
18 Even numbers which cannot be expressed as the sum of two twin primes
18 Geometric algebra
18 Jaccard index
18 NYSIIS
18 Non-transitive dice
18 Pan base non-primes
18 Particle swarm optimization
18 Pentomino tiling
18 Polynomial derivative
18 Ramanujan primes
18 Ramanujan's constant
18 Rendezvous O
18 Sorting algorithms/Tree sort on a linked list
18 Square form factorization
18 Suffix tree
18 Topological sort/Extracted top item
18 Triangular numbers
18 Tropical algebra overloading
18 Walsh matrix
17 ADFGVX cipher
17 Boustrophedon transform
17 CORDIC
17 Canny edge detector
17 Find Chess960 starting position identifier
17 Four is the number of letters in the ...
17 Gotchas
17 Graph colouring
17 Iterators
17 Multi-base primes
17 Overloaded operators
17 Rodrigues’ rotation formula
17 Search in paragraph's text
17 Tetris
17 Unit testing
17 Untouchable numbers
17 Verhoeff algorithm
17 Wordiff
16 ASCII control characters
16 Boyer-Moore string search
16 Count the coins/0-1
16 Display an outline as a nested table
16 Distance and Bearing
16 Erdös-Selfridge categorization of primes
16 Faces from a mesh
16 Factorial base numbers indexing permutations of a collection
16 Functional coverage tree
16 Gaussian primes
16 Interactive help
16 Inventory sequence
16 Isograms and heterograms
16 Mayan calendar
16 Railway circuit
16 Rainbow
16 Ramanujan primes/twins
16 Run as a daemon or service
16 Set, the card game
16 Simple turtle graphics
16 Sisyphus sequence
16 Text completion
15 Anaprimes
15 Binomial transform
15 Catmull–Clark subdivision surface
15 Centroid of a set of N-dimensional points
15 Check if two polygons overlap
15 Fermat pseudoprimes
15 Magic numbers
15 One-time pad
15 Penholodigital squares
15 Prime numbers whose neighboring pairs are tetraprimes
15 Sieve of Pritchard
15 Smarandache-Wellin primes
15 Solve equations with substitution method
15 Tree datastructures
15 Undulating numbers
14 16 puzzle game
14 Check if a polygon overlaps with a rectangle
14 Checksumcolor
14 Colour pinstripe/Printer
14 Deconvolution/2D+
14 Execute CopyPasta Language
14 Fibonacci matrix-exponentiation
14 Generalised floating point addition
14 Greed
14 Hourglass puzzle
14 Knuth-Morris-Pratt string search
14 L-system
14 Launch rocket with countdown and acceleration in stdout
14 Powerful numbers
14 Singly-linked list/Reversal
14 Smallest number k such that k+2^m is composite for all m less than k
14 Sort an outline at every level
14 Suffixation of decimal numbers
14 Super-Poulet numbers
14 Time-based one-time password algorithm
14 Tupper's self-referential formula
14 Using a speech engine to highlight words
13 Apéry's constant
13 Bioinformatics/Global alignment
13 Countdown
13 Factorize string into Lyndon words
13 French Republican calendar
13 Least m such that n! + m is prime
13 One-two primes
13 Prime reciprocal sum
13 Range modifications
13 Resistance calculator
13 Rice coding
13 Rosetta Code/Rank languages by number of users
13 Singular value decomposition
13 Spoof game
13 Terminal control/Restricted width positional input/No wrapping
13 Wasteful, equidigital and frugal numbers
12 Babylonian spiral
12 Brace expansion using ranges
12 Combinations with repetitions/Square digit chain
12 Distinct palindromes within decimal numbers
12 Elliptic Curve Digital Signature Algorithm
12 External sort
12 IPC via named pipe
12 Morpion solitaire
12 Parse EBNF
12 Particle fountain
12 Peripheral drift illusion
12 Pinstripe/Printer
12 Rosetta Code/Tasks without examples
12 Starting a web browser
12 Terminal control/Restricted width positional input/With wrapping
12 Transliterate English text using the Greek alphabet
12 Worthwhile task shaving
11 Addition-chain exponentiation
11 Discrete Fourier transform
11 Doubly-linked list/Element removal
11 GSTrans string conversion
11 Greatest prime dividing the n-th cubefree number
11 Hashtron inference
11 Hex dump
11 I'm a software engineer, get me out of here
11 Integer long division
11 N-queens minimum and knights and bishops
11 Numbers k such that the last letter of k is the same as the first letter of k+1
11 Numerical and alphabetical suffixes
11 OpenGL/Utah teapot
11 Price list behind API
11 Smallest enclosing circle problem
11 Sorensen–Dice coefficient
11 Statistics/Chi-squared distribution
11 Sync subtitles
11 URL shortener
10 Black box
10 Compiler/Verifying syntax
10 Cycles of a permutation
10 Factor-perfect numbers
10 P-Adic numbers, basic
10 Random sentence from book
10 Raster bars
10 Resistance network calculator
10 Robots
10 Sealed classes and methods
10 Strassen's algorithm
10 Tamagotchi emulator
10 Text to HTML
10 Universal Lambda Machine
10 User defined pipe and redirection operators
9 Audio overlap loop
9 B-spline
9 Consistent overhead byte stuffing
9 Dating agency
9 Eisenstein primes
9 Engel expansion
9 Fibonacci heap
9 Horse racing
9 Inner classes
9 JSON pointer
9 Marching squares
9 Multidimensional Newton-Raphson method
9 OpenGL pixel shader
9 Rosetta Code/Run examples
9 Segmentation fault protection
9 Selection bias in clinical sciences
9 Variadic fixed-point combinator
8 Anagram generator
8 Exponential digital sums
8 Hexapawn
8 Lagrange Interpolation
8 Lucas-Carmichael numbers
8 Lyndon word
8 P-Adic square roots
8 Recursive descent parser generator
8 Remote agent/Agent logic
8 Remote agent/Simulation
8 Simulated optics experiment/Data analysis
8 Simulated optics experiment/Simulator
8 Syntax highlighting using Mediawiki formatting
8 Waveform analysis/Doh ray me O O
8 WiktionaryDumps to words
7 Autogram checker
7 Boids
7 Chess player
7 Compiler/Simple file inclusion pre processor
7 Create an executable for a program in an interpreted language
7 Divide a rectangle into a number of unequal triangles
7 Dominoes
7 English cardinal anagrams
7 Latin Squares in reduced form/Randomizing using Jacobson and Matthews' technique
7 Process SMIL directives in XML data
7 Red black tree sort
7 Remote agent/Agent interface
7 Roots of a cubic polynomial
7 Solve a Rubik's cube
7 Visitor pattern
7 Wave function collapse
6 CLI-based maze-game
6 Carmichael lambda function
6 Convert CSV records to TSV
6 Create your own text control codes
6 Erdős–Woods numbers
6 Goodstein Sequence
6 Multiton
6 OLE automation O O
6 Posit numbers/encoding
6 Rosetta Code/List authors of task descriptions
6 Sturmian word
6 Szymański's algorithm
6 Ukkonen’s suffix tree construction
6 Use a REST API
6 Vidir
5 Continued fraction convergents
5 Diophantine linear system solving
5 Extended Straddling Checkerboard
5 Generalised floating point multiplication
5 Number triplets game
5 Posit numbers/decoding
5 Sanitize user input
5 Solving coin problems
5 Unicode polynomial equation
5 Waveform analysis/Top and tail O
5 Weather routing
4 15 puzzle game in 3D
4 Blackjack strategy
4 Color separation
4 Compiler/Preprocessor
4 Cross compilation
4 IRC gateway
4 Protecting Memory Secrets
4 Uno (card game)
4 WebGL rotating F
3 3d turtle graphics
3 Elevator simulation