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
All Languages
><>
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
Bytes
Chars
Scoring
Bytes
Chars
Language
All
><>
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
118
13 hours ago
π
m4xxh
1,059
a day ago
Spelling Numbers
Shanethegamer
💎
351
2 days ago
Rijndael S-box
JayXon
🥉
126
5 days ago
Niven Numbers (Long)
pardouin
81
8 days ago
Polyominoes
dokutan
🥉
1,348
10 days ago
Pangram Grep
emgordon154
112
10 days ago
Tongue-twisters
dokutan
452
13 days ago
Gijswijt’s Sequence
dokutan
227
13 days ago
Quine
CaedenHarper
85
15 days ago
Diamonds
dokutan
393
15 days ago
Foo Fizz Buzz Bar
dokutan
157
17 days ago
Zeckendorf Representation
Shanethegamer
135
18 days ago
99 Bottles of Beer
dokutan
472
19 days ago
Maze
emgordon154
422
19 days ago
Sierpiński Triangle
dokutan
269
22 days ago
Pascal’s Triangle
dokutan
752
22 days ago
N Queens
dokutan
1,244
22 days ago
Kolakoski Sequence
dokutan
378
22 days ago
Factorial Factorisation
dokutan
863
22 days ago
Ascending Primes
dokutan
491
22 days ago
Card Number Validation
MeWhenI
115
24 days ago
Gijswijt’s Sequence
Mabeloid
2,038
25 days ago
Number Spiral
Mabeloid
338
25 days ago
Prime Numbers
Mabeloid
109
25 days ago
Prime Numbers (Long)
Mabeloid
5,986
25 days ago
Card Number Validation
JayXon
💎
95
25 days ago
Card Number Validation
Shanethegamer
🥈
102
25 days ago
Pernicious Numbers
Mabeloid
138
25 days ago
Pernicious Numbers (Long)
Mabeloid
20,700
25 days ago
Pascal’s Triangle
Mabeloid
807
25 days ago
Inventory Sequence
Mabeloid
2,661
25 days ago
Recamán
Mabeloid
935
26 days ago
Van Eck Sequence
Mabeloid
2,593
26 days ago
Cubes
Mabeloid
4,139
26 days ago
Arithmetic Numbers
Mabeloid
37,680
26 days ago
Card Number Validation
sean-niemann
🥉
105
27 days ago
√2
olleicua
1,041
27 days ago
Leap Years
dokutan
74
27 Sep 2024
Fibonacci
pardouin
🥇
63
24 Sep 2024
Odious Numbers
Mabeloid
111
22 Sep 2024
Odious Numbers (Long)
Mabeloid
1,983
22 Sep 2024
Rule 110
Mabeloid
15,890
22 Sep 2024
Leap Years
Mabeloid
768
22 Sep 2024
Niven Numbers
Mabeloid
129
22 Sep 2024
Niven Numbers (Long)
Mabeloid
7,476
22 Sep 2024
Leyland Numbers
Mabeloid
924
22 Sep 2024
Sierpiński Triangle
Mabeloid
592
22 Sep 2024
Kolakoski Sequence
Mabeloid
2,038
21 Sep 2024
Rijndael S-box
Mabeloid
806
21 Sep 2024
ln 2
Mabeloid
1,041
20 Sep 2024
Look and Say
Mabeloid
1,317
20 Sep 2024
Lucky Numbers
Mabeloid
4,858
20 Sep 2024
Kolakoski Constant
Mabeloid
1,041
20 Sep 2024
Quine
madeforlosers
85
20 Sep 2024
Happy Numbers
Mabeloid
145
20 Sep 2024
PalindromemordnilaP
JayXon
💎
111
20 Sep 2024
Fizz Buzz
Mabeloid
451
18 Sep 2024
Foo Fizz Buzz Bar
Mabeloid
5,757
18 Sep 2024
Fibonacci
Mabeloid
172
18 Sep 2024
Happy Numbers (Long)
Mabeloid
590
18 Sep 2024
Abundant Numbers
Mabeloid
201
18 Sep 2024
Abundant Numbers (Long)
Mabeloid
1,002
18 Sep 2024
24 Game
Mabeloid
12,470
18 Sep 2024
Factorial Factorisation
Mabeloid
900
17 Sep 2024
Evil Numbers (Long)
Mabeloid
1,988
17 Sep 2024
Evil Numbers
Mabeloid
108
17 Sep 2024
Emirp Numbers
Mabeloid
174
17 Sep 2024
Emirp Numbers (Long)
Mabeloid
1,194
17 Sep 2024
Divisors
Mabeloid
1,204
17 Sep 2024
Diamonds
Mabeloid
1,141
17 Sep 2024
Collatz
Mabeloid
3,264
17 Sep 2024
Catalan Numbers
Mabeloid
2,910
17 Sep 2024
Catalan’s Constant
Mabeloid
1,041
17 Sep 2024
ASCII Table
Mabeloid
312
17 Sep 2024