The
Kaprekar Numbers
hole will go live in
2 days
. Why not try and solve it ahead of time?
Recent Solutions
Golfers
Solutions
All Holes
12 Days of Christmas
24 Game
99 Bottles of Beer
Abundant Numbers
Abundant Numbers (Long)
Arabic to Roman
Arithmetic Numbers
Arrows
Ascending Primes
ASCII Table
brainfuck
Card Number Validation
Catalan Numbers
Catalan’s Constant
Christmas Trees
Collatz
CSS Colors
Cubes
Day of Week
DFA Simulator
Diamonds
Divisors
Emirp Numbers
Emirp Numbers (Long)
Emojify
Evil Numbers
Evil Numbers (Long)
Factorial Factorisation
Farey Sequence
Fibonacci
Fizz Buzz
Foo Fizz Buzz Bar
Forsyth–Edwards Notation
Fractions
Game of Life
Gijswijt’s Sequence
Happy Numbers
Happy Numbers (Long)
Hexdump
Intersection
Inventory Sequence
ISBN
Jacobi Symbol
Kolakoski Constant
Kolakoski Sequence
Leap Years
Levenshtein Distance
Leyland Numbers
ln 2
Look and Say
Lucky Numbers
Lucky Tickets
Mahjong
Maze
Medal Tally
Morse Decoder
Morse Encoder
Musical Chords
N Queens
Niven Numbers
Niven Numbers (Long)
Number Spiral
Odious Numbers
Odious Numbers (Long)
Ordinal Numbers
PalindromemordnilaP
Pangram Grep
Pascal’s Triangle
Pernicious Numbers
Pernicious Numbers (Long)
Poker
Polyominoes
Prime Numbers
Prime Numbers (Long)
Proximity Grid
QR Decoder
Quine
Recamán
Repeating Decimals
Reverse Polish Notation
Reversi
Rijndael S-box
Rock-paper-scissors-Spock-lizard
Roman to Arabic
Rule 110
Seven Segment
SI Units
Sierpiński Triangle
Smith Numbers
Spelling Numbers
Star Wars Opening Crawl
Sudoku
Sudoku (Fill-in)
Ten-pin Bowling
Time Distance
Tongue-twisters
Transpose Sentence
United States
Vampire Numbers
Van Eck Sequence
Zeckendorf Representation
Zodiac Signs
γ
λ
π
τ
φ
√2
𝑒
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brainfuck
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Language
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><>
Assembly
AWK
Bash
BASIC
Berry
brainfuck
C
C#
C++
Civet
Clojure
COBOL
Coconut
Crystal
D
Dart
Elixir
F#
Factor
Forth
Fortran
Go
GolfScript
Haskell
Hexagony
J
Janet
Java
JavaScript
jq
Julia
K
Kotlin
Lisp
Lua
Nim
OCaml
Pascal
Perl
PHP
PowerShell
Prolog
Python
R
Raku
Rockstar
Ruby
Rust
Scheme
sed
SQL
Swift
Tcl
TeX
V
VimL
Wren
Zig
Hole
All
12 Days of Christmas
24 Game
99 Bottles of Beer
Abundant Numbers
Abundant Numbers (Long)
Arabic to Roman
Arithmetic Numbers
Arrows
Ascending Primes
ASCII Table
brainfuck
Card Number Validation
Catalan Numbers
Catalan’s Constant
Christmas Trees
Collatz
CSS Colors
Cubes
Day of Week
DFA Simulator
Diamonds
Divisors
Emirp Numbers
Emirp Numbers (Long)
Emojify
Evil Numbers
Evil Numbers (Long)
Factorial Factorisation
Farey Sequence
Fibonacci
Fizz Buzz
Foo Fizz Buzz Bar
Forsyth–Edwards Notation
Fractions
Game of Life
Gijswijt’s Sequence
Happy Numbers
Happy Numbers (Long)
Hexdump
Intersection
Inventory Sequence
ISBN
Jacobi Symbol
Kolakoski Constant
Kolakoski Sequence
Leap Years
Levenshtein Distance
Leyland Numbers
ln 2
Look and Say
Lucky Numbers
Lucky Tickets
Mahjong
Maze
Medal Tally
Morse Decoder
Morse Encoder
Musical Chords
N Queens
Niven Numbers
Niven Numbers (Long)
Number Spiral
Odious Numbers
Odious Numbers (Long)
Ordinal Numbers
PalindromemordnilaP
Pangram Grep
Pascal’s Triangle
Pernicious Numbers
Pernicious Numbers (Long)
Poker
Polyominoes
Prime Numbers
Prime Numbers (Long)
Proximity Grid
QR Decoder
Quine
Recamán
Repeating Decimals
Reverse Polish Notation
Reversi
Rijndael S-box
Rock-paper-scissors-Spock-lizard
Roman to Arabic
Rule 110
Seven Segment
SI Units
Sierpiński Triangle
Smith Numbers
Spelling Numbers
Star Wars Opening Crawl
Sudoku
Sudoku (Fill-in)
Ten-pin Bowling
Time Distance
Tongue-twisters
Transpose Sentence
United States
Vampire Numbers
Van Eck Sequence
Zeckendorf Representation
Zodiac Signs
γ
λ
π
τ
φ
√2
𝑒
Hole
Golfer
Bytes
Submitted
π
m4xxh
1,010
a day ago
Rock-paper-scissors-Spock-lizard
dokutan
833
10 days ago
12 Days of Christmas
dokutan
684
12 days ago
Tongue-twisters
dokutan
419
13 days ago
Cubes
dokutan
888
13 days ago
Christmas Trees
dokutan
307
15 days ago
Polyominoes
Shanethegamer
3,570
20 days ago
Polyominoes
dokutan
🥉
1,349
21 days ago
Rule 110
dokutan
2,145
23 days ago
24 Game
dokutan
🥉
5,020
23 days ago
Gijswijt’s Sequence
dokutan
203
23 days ago
Gijswijt’s Sequence
Mabeloid
2,007
25 days ago
Number Spiral
Mabeloid
307
25 days ago
Prime Numbers
Mabeloid
78
25 days ago
Prime Numbers (Long)
Mabeloid
5,955
25 days ago
Pernicious Numbers
Mabeloid
107
25 days ago
Pernicious Numbers (Long)
Mabeloid
20,669
25 days ago
Pascal’s Triangle
Mabeloid
776
25 days ago
Inventory Sequence
Mabeloid
2,630
25 days ago
Recamán
Mabeloid
904
26 days ago
Van Eck Sequence
Mabeloid
2,562
26 days ago
Cubes
Mabeloid
4,108
26 days ago
Arithmetic Numbers
Mabeloid
37,649
26 days ago
Arithmetic Numbers
edsrzf
73
26 days ago
Card Number Validation
chunes3
🥈
73
27 days ago
Pangram Grep
edsrzf
71
1 Oct 2024
Card Number Validation
edsrzf
76
1 Oct 2024
Card Number Validation
Kacarott
🥈
73
1 Oct 2024
Card Number Validation
GrayJoKing
79
1 Oct 2024
Card Number Validation
ovs-code
75
1 Oct 2024
Card Number Validation
error256
💎
70
1 Oct 2024
Fractions
edsrzf
56
29 Sep 2024
Smith Numbers
edsrzf
143
27 Sep 2024
Catalan Numbers
edsrzf
68
27 Sep 2024
Collatz
edsrzf
102
27 Sep 2024
Foo Fizz Buzz Bar
edsrzf
142
27 Sep 2024
Divisors
edsrzf
73
26 Sep 2024
Fizz Buzz
edsrzf
116
26 Sep 2024
ASCII Table
error256
130
26 Sep 2024
Arabic to Roman
DialFrost
🥇
53
26 Sep 2024
brainfuck
edsrzf
283
26 Sep 2024
Abundant Numbers (Long)
edsrzf
80
26 Sep 2024
Abundant Numbers
edsrzf
80
26 Sep 2024
CSS Colors
edsrzf
69
26 Sep 2024
Niven Numbers (Long)
edsrzf
🥇
55
26 Sep 2024
Niven Numbers
edsrzf
49
25 Sep 2024
Evil Numbers (Long)
DialFrost
43
25 Sep 2024
Pernicious Numbers (Long)
edsrzf
50
25 Sep 2024
Pernicious Numbers
edsrzf
49
25 Sep 2024
Emirp Numbers (Long)
edsrzf
83
25 Sep 2024
Emirp Numbers
edsrzf
82
25 Sep 2024
Roman to Arabic
DialFrost
49
25 Sep 2024
Evil Numbers
edsrzf
38
25 Sep 2024
Evil Numbers (Long)
edsrzf
🥇
39
25 Sep 2024
Odious Numbers (Long)
edsrzf
🥇
39
25 Sep 2024
Odious Numbers
edsrzf
38
25 Sep 2024
Factorial Factorisation
edsrzf
197
25 Sep 2024
Leap Years
DialFrost
🥇
42
25 Sep 2024
Evil Numbers
DialFrost
42
25 Sep 2024
Odious Numbers (Long)
DialFrost
42
25 Sep 2024
Pernicious Numbers (Long)
DialFrost
🥇
44
25 Sep 2024
Pernicious Numbers
DialFrost
🥇
43
25 Sep 2024
Quine
pardouin
26
25 Sep 2024
Leap Years
pardouin
🥇
42
25 Sep 2024
Fractions
pardouin
🥇
54
25 Sep 2024
Leap Years
edsrzf
🥇
42
25 Sep 2024
Ascending Primes
edsrzf
151
25 Sep 2024
Day of Week
pardouin
🥇
53
25 Sep 2024
Levenshtein Distance
edsrzf
🥇
59
25 Sep 2024
Reverse Polish Notation
pardouin
🥇
40
25 Sep 2024
Roman to Arabic
edsrzf
🥇
45
25 Sep 2024
Arabic to Roman
edsrzf
🥇
53
25 Sep 2024
Reverse Polish Notation
edsrzf
🥇
40
25 Sep 2024
Day of Week
edsrzf
🥇
53
25 Sep 2024
Game of Life
Kacarott
💎
132
24 Sep 2024