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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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
Christmas Trees
Shanethegamer
115
13 hours ago
𝑒
BREMAUCY
1,016
4 days ago
Niven Numbers (Long)
pardouin
🥇
79
8 days ago
Proximity Grid
Shanethegamer
💎
241
10 days ago
Recamán
dokutan
910
10 days ago
Rijndael S-box
dokutan
781
10 days ago
Sierpiński Triangle
dokutan
567
10 days ago
Tongue-twisters
dokutan
536
10 days ago
ASCII Table
dokutan
287
10 days ago
Game of Life
Shanethegamer
🥉
181
11 days ago
Fizz Buzz
aliakseikalosha
128
15 days ago
Quine
CaedenHarper
🥇
66
15 days ago
Catalan Numbers
pardouin
2,602
19 days ago
Fibonacci
pardouin
🥇
54
20 days ago
Fizz Buzz
Clay-Goodling
129
21 days ago
Reverse Polish Notation
Vinterion
212
23 days ago
Gijswijt’s Sequence
Mabeloid
2,013
25 days ago
Number Spiral
Mabeloid
313
25 days ago
Prime Numbers
Mabeloid
84
25 days ago
Prime Numbers (Long)
Mabeloid
5,961
25 days ago
Pernicious Numbers
Mabeloid
113
25 days ago
Pernicious Numbers (Long)
Mabeloid
20,675
25 days ago
Pascal’s Triangle
Mabeloid
782
25 days ago
Inventory Sequence
Mabeloid
2,636
25 days ago
Card Number Validation
m-tkach
💎
138
26 days ago
Recamán
Mabeloid
910
26 days ago
Van Eck Sequence
Mabeloid
2,568
26 days ago
Cubes
Mabeloid
4,114
26 days ago
Arithmetic Numbers
Mabeloid
37,655
26 days ago
Card Number Validation
Shanethegamer
🥈
156
27 days ago
DFA Simulator
Shanethegamer
🦄
251
28 Sep 2024
PalindromemordnilaP
m-tkach
💎
177
27 Sep 2024
Zeckendorf Representation
m-tkach
💎
136
27 Sep 2024
N Queens
m-tkach
💎
157
27 Sep 2024
Leap Years
dokutan
70
25 Sep 2024
Quine
JayXon
🥇
66
24 Sep 2024
Morse Encoder
KatieLG
1,833
23 Sep 2024
Odious Numbers
Mabeloid
86
22 Sep 2024
Odious Numbers (Long)
Mabeloid
1,958
22 Sep 2024
Rule 110
Mabeloid
15,865
22 Sep 2024
Leap Years
Mabeloid
743
22 Sep 2024
Niven Numbers
Mabeloid
104
22 Sep 2024
Niven Numbers (Long)
Mabeloid
7,451
22 Sep 2024
Leyland Numbers
Mabeloid
899
22 Sep 2024
Sierpiński Triangle
Mabeloid
567
22 Sep 2024
Fibonacci
edsrzf
71
22 Sep 2024
Kolakoski Sequence
Mabeloid
2,013
21 Sep 2024
Rijndael S-box
Mabeloid
781
21 Sep 2024
Niven Numbers
dokutan
68
21 Sep 2024
Prime Numbers (Long)
dokutan
112
21 Sep 2024
Odious Numbers (Long)
dokutan
113
21 Sep 2024
Evil Numbers (Long)
dokutan
114
21 Sep 2024
ln 2
Mabeloid
1,016
20 Sep 2024
Look and Say
Mabeloid
1,292
20 Sep 2024
Lucky Numbers
Mabeloid
4,833
20 Sep 2024
Kolakoski Constant
Mabeloid
1,016
20 Sep 2024
Quine
madeforlosers
🥇
66
20 Sep 2024
Happy Numbers
Mabeloid
120
20 Sep 2024
Pangram Grep
KatieLG
212
20 Sep 2024
Fizz Buzz
RedzGoose
140
18 Sep 2024
Fizz Buzz
Mabeloid
426
18 Sep 2024
Foo Fizz Buzz Bar
Mabeloid
5,732
18 Sep 2024
√2
olleicua
1,016
18 Sep 2024
Collatz
MateuszPietrzak
118
18 Sep 2024
Fibonacci
Mabeloid
147
18 Sep 2024
Happy Numbers (Long)
Mabeloid
565
18 Sep 2024
Abundant Numbers
Mabeloid
176
18 Sep 2024
Abundant Numbers (Long)
Mabeloid
977
18 Sep 2024
24 Game
Mabeloid
🥉
12,445
18 Sep 2024
Fizz Buzz
enbyte
163
17 Sep 2024
Evil Numbers (Long)
Mabeloid
1,963
17 Sep 2024
Factorial Factorisation
Mabeloid
🥉
875
17 Sep 2024
Evil Numbers
Mabeloid
83
17 Sep 2024
Emirp Numbers
Mabeloid
149
17 Sep 2024
Emirp Numbers (Long)
Mabeloid
1,169
17 Sep 2024