The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
Kaprekar Numbers in all languages in bytes. Achievements Cheevos Holes Languages Medals Miscellaneous 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 Billiards 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 Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper 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 Partition Numbers 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 ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Apéry’s Constant Binary Lambda Calculus Calendar Connect Four Continued Fractions Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers Multitap Input NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial All Languages ><> Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig 05AB1E ALGOL 68 APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Bytes Chars Scoring Bytes Chars Language All ><> Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig Experimental Language 05AB1E ALGOL 68 APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal 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 Billiards 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 Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper 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 Partition Numbers 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 ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Experimental Hole Apéry’s Constant Binary Lambda Calculus Calendar Connect Four Continued Fractions Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers Multitap Input NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial # Golfer Points Bytes Time Submitted 800th Shanethegamer 🇺🇸 144 452 335ms 1 Nov 2024 802nd KatieLG 🇬🇧 142 469 7ms 18 days ago 803rd HumanoidCPU 141 446 72ms 1 Nov 2024 803rd Shanethegamer 🇺🇸 141 446 73ms 1 Nov 2024 803rd MeWhenI 🇻🇦 141 446 79ms 2 Nov 2024 803rd snoozingnewt 🇨🇦 141 446 77ms 3 Nov 2024 803rd CaedenHarper 🇨🇦 141 446 71ms 16 Aug 2025 808th dokutan 139 452 76ms 1 Nov 2024 809th emgordon154 139 602 2,029ms 12 Dec 2024 810th KatieLG 🇬🇧 138 505 625ms 18 days ago 811th HumanoidCPU 136 575 41ms 9 Mar 2025 812th KatieLG 🇬🇧 135 465 110ms 18 days ago 813th dokutan 134 473 2ms 1 Nov 2024 814th KatieLG 🇬🇧 133 475 1ms 1 Nov 2024 815th dokutan 133 483 1ms 21 Jun 2025 816th dokutan 133 591 40ms 1 Nov 2024 817th KatieLG 🇬🇧 132 487 1ms 18 days ago 818th KatieLG 🇬🇧 131 443 2ms 18 days ago 819th HumanoidCPU 131 444 2ms 1 Nov 2024 819th Shanethegamer 🇺🇸 131 444 3ms 1 Nov 2024 819th dokutan 131 444 2ms 1 Nov 2024 819th MeWhenI 🇻🇦 131 444 2ms 2 Nov 2024 819th CaedenHarper 🇨🇦 131 444 2ms 16 Aug 2025 824th KatieLG 🇬🇧 130 515 1ms 8 Jan 2025 825th KatieLG 🇬🇧 127 530 1ms 1 Nov 2024 826th sciencejiho 127 532 2ms 12 Feb 2025 827th dokutan 126 439 33ms 21 Apr 2025 827th olleicua 🇺🇸 126 439 47ms 12 Jun 2025 829th HumanoidCPU 124 445 42ms 1 Nov 2024 829th Shanethegamer 🇺🇸 124 445 53ms 1 Nov 2024 829th CaedenHarper 🇨🇦 124 445 40ms 16 Aug 2025 832nd MeWhenI 🇻🇦 124 515 1ms 2 Nov 2024 832nd CaedenHarper 🇨🇦 124 515 1ms 12 Nov 2025 832nd Shanethegamer 🇺🇸 124 515 1ms 12 Nov 2025 832nd HumanoidCPU 124 515 1ms 12 Nov 2025 836th HumanoidCPU 122 518 2ms 1 Nov 2024 836th Shanethegamer 🇺🇸 122 518 2ms 1 Nov 2024 836th MeWhenI 🇻🇦 122 518 2ms 2 Nov 2024 836th CaedenHarper 🇨🇦 122 518 1ms 22 Jan 2025 840th dokutan 121 453 124ms 1 Nov 2024 840th Shanethegamer 🇺🇸 121 453 117ms 1 Nov 2024 840th KatieLG 🇬🇧 121 453 114ms 1 Nov 2024 840th MeWhenI 🇻🇦 121 453 116ms 2 Nov 2024 840th CaedenHarper 🇨🇦 121 453 116ms 24 Jan 2025 845th KatieLG 🇬🇧 120 461 37ms 18 days ago 846th HumanoidCPU 119 446 8ms 1 Nov 2024 846th dokutan 119 446 9ms 1 Nov 2024 846th KatieLG 🇬🇧 119 446 9ms 1 Nov 2024 846th MeWhenI 🇻🇦 119 446 8ms 2 Nov 2024 846th zakariamouhid 119 446 9ms 17 Nov 2024 846th Salutations45 119 446 8ms 22 Nov 2024 846th gigaprofisi 🇺🇸 119 446 9ms 20 Jun 2025 846th didion0 🇺🇸 119 446 9ms 26 Aug 2025 846th olleicua 🇺🇸 119 446 9ms 10 Sep 2025 855th iczelia 🇩🇪 119 447 9ms 24 Oct 2025 856th Quadruplay 119 448 8ms 12 Jul 2025 857th HumanoidCPU 117 446 1,005ms 1 Nov 2024 857th Shanethegamer 🇺🇸 117 446 998ms 1 Nov 2024 857th dokutan 117 446 967ms 1 Nov 2024 857th CaedenHarper 🇨🇦 117 446 1,033ms 24 Jan 2025 861st HumanoidCPU 117 448 152ms 1 Nov 2024 861st dokutan 117 448 216ms 1 Nov 2024 861st MeWhenI 🇻🇦 117 448 188ms 2 Nov 2024 861st MarcMush 🇫🇷 117 448 227ms 19 Nov 2024 861st CaedenHarper 🇨🇦 117 448 223ms 1 Feb 2025 866th JOrE20 🇺🇸 116 457 9ms 6 Nov 2025 867th KatieLG 🇬🇧 114 461 780ms 18 days ago 868th KatieLG 🇬🇧 112 467 223ms 18 days ago 869th HumanoidCPU 111 453 50ms 1 Nov 2024 870th MeWhenI 🇻🇦 111 454 52ms 2 Nov 2024 871st CaedenHarper 🇨🇦 109 461 51ms 22 Jan 2025 871st Shanethegamer 🇺🇸 109 461 50ms 6 May 2025 873rd KatieLG 🇬🇧 109 463 50ms 1 Nov 2024 874th HumanoidCPU 106 520 113ms 1 Nov 2024 875th HumanoidCPU 93 449 32ms 1 Nov 2024 875th MeWhenI 🇻🇦 93 449 30ms 2 Nov 2024 875th CaedenHarper 🇨🇦 93 449 36ms 25 Jan 2025 875th snoozingnewt 🇨🇦 93 449 32ms 14 Sep 2025 879th KatieLG 🇬🇧 93 451 32ms 1 Nov 2024 880th dokutan 91 462 32ms 1 Nov 2024 First Prev 801–880 of 988 Next Last