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
Farey Sequence
dokutan
105
2 days ago
Leap Years
error256
38
2 days ago
π
m4xxh
1,009
3 days ago
PalindromemordnilaP
anter69
72
4 days ago
Factorial Factorisation
anter69
119
4 days ago
Niven Numbers
FlyingPenguin223
34
4 days ago
Niven Numbers (Long)
FlyingPenguin223
34
4 days ago
Arithmetic Numbers
anter69
58
5 days ago
ln 2
anter69
72
5 days ago
γ
anter69
682
5 days ago
Foo Fizz Buzz Bar
anter69
89
5 days ago
Van Eck Sequence
anter69
54
5 days ago
CSS Colors
anter69
773
5 days ago
Pernicious Numbers
FlyingPenguin223
27
5 days ago
Day of Week
dokutan
69
6 days ago
Zeckendorf Representation
stefangimmillaro
95
7 days ago
Evil Numbers (Long)
FlyingPenguin223
34
9 days ago
Evil Numbers
FlyingPenguin223
33
9 days ago
Arithmetic Numbers
stefangimmillaro
58
10 days ago
Rijndael S-box
error256
95
12 days ago
Seven Segment
dokutan
161
12 days ago
Seven Segment
anter69
109
13 days ago
Niven Numbers
cdesodt
101
13 days ago
Tongue-twisters
dokutan
386
13 days ago
DFA Simulator
KatieLG
207
13 days ago
Sierpiński Triangle
dokutan
200
13 days ago
Gijswijt’s Sequence
dokutan
164
13 days ago
𝑒
stefangimmillaro
🥉
63
14 days ago
Fizz Buzz
aliakseikalosha
84
15 days ago
Quine
CaedenHarper
46
15 days ago
United States
KatieLG
827
16 days ago
Proximity Grid
KatieLG
3,699
16 days ago
Hexdump
KatieLG
5,174
16 days ago
Card Number Validation
JayXon
🥇
63
16 days ago
Fizz Buzz
anter69
61
18 days ago
Diamonds
pardouin
92
19 days ago
Divisors
pardouin
🥇
48
19 days ago
Zodiac Signs
anter69
143
21 days ago
Arabic to Roman
dokutan
201
21 days ago
Forsyth–Edwards Notation
dokutan
384
21 days ago
Fractions
dokutan
93
21 days ago
Forsyth–Edwards Notation
anter69
102
21 days ago
Card Number Validation
error256
🥇
63
22 days ago
Quine
dokutan
54
22 days ago
Rule 110
dokutan
1,966
23 days ago
Polyominoes
dokutan
1,275
23 days ago
Pascal’s Triangle
dokutan
704
23 days ago
N Queens
dokutan
1,158
23 days ago
Look and Say
dokutan
662
23 days ago
Kolakoski Sequence
dokutan
319
23 days ago
Factorial Factorisation
dokutan
791
23 days ago
Diamonds
dokutan
315
23 days ago
Cubes
dokutan
834
23 days ago
Catalan Numbers
dokutan
2,572
23 days ago
24 Game
dokutan
4,900
23 days ago
Evil Numbers
pardouin
31
23 days ago
Fibonacci
pardouin
25
23 days ago
Niven Numbers (Long)
pardouin
34
24 days ago
Gijswijt’s Sequence
Mabeloid
2,006
25 days ago
Number Spiral
Mabeloid
306
25 days ago
Prime Numbers
Mabeloid
77
25 days ago
Prime Numbers (Long)
Mabeloid
5,954
25 days ago
Levenshtein Distance
edsrzf
🥇
72
25 days ago
Card Number Validation
pardouin
71
25 days ago
Pernicious Numbers
Mabeloid
106
25 days ago
Pernicious Numbers (Long)
Mabeloid
20,668
25 days ago
Pascal’s Triangle
Mabeloid
775
25 days ago
Inventory Sequence
Mabeloid
2,629
25 days ago
Card Number Validation
Shanethegamer
67
25 days ago
Card Number Validation
MeWhenI
🥉
64
25 days ago
Recamán
Mabeloid
903
26 days ago
Van Eck Sequence
Mabeloid
2,561
26 days ago
Cubes
Mabeloid
4,107
26 days ago
Arithmetic Numbers
Mabeloid
37,648
26 days ago
Cubes
MeWhenI
🥇
161
26 days ago