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 801st HumanoidCPU 141 446 72ms 1 Nov 2024 801st Shanethegamer 🇺🇸 141 446 73ms 1 Nov 2024 801st MeWhenI 🇻🇦 141 446 79ms 2 Nov 2024 801st snoozingnewt 🇨🇦 141 446 77ms 3 Nov 2024 801st CaedenHarper 🇨🇦 141 446 71ms 16 Aug 2025 806th dokutan 139 452 76ms 1 Nov 2024 807th emgordon154 139 602 2,029ms 12 Dec 2024 808th KatieLG 🇬🇧 138 505 625ms 18 days ago 809th HumanoidCPU 136 575 41ms 9 Mar 2025 810th KatieLG 🇬🇧 135 465 110ms 18 days ago 811th dokutan 134 473 2ms 1 Nov 2024 812th KatieLG 🇬🇧 133 475 1ms 1 Nov 2024 813th dokutan 133 483 1ms 21 Jun 2025 814th dokutan 133 591 40ms 1 Nov 2024 815th KatieLG 🇬🇧 132 487 1ms 18 days ago 816th KatieLG 🇬🇧 131 443 2ms 18 days ago 817th HumanoidCPU 131 444 2ms 1 Nov 2024 817th Shanethegamer 🇺🇸 131 444 3ms 1 Nov 2024 817th dokutan 131 444 2ms 1 Nov 2024 817th MeWhenI 🇻🇦 131 444 2ms 2 Nov 2024 817th CaedenHarper 🇨🇦 131 444 2ms 16 Aug 2025 822nd KatieLG 🇬🇧 130 515 1ms 8 Jan 2025 823rd KatieLG 🇬🇧 127 530 1ms 1 Nov 2024 824th sciencejiho 127 532 2ms 12 Feb 2025 825th dokutan 126 439 33ms 21 Apr 2025 825th olleicua 🇺🇸 126 439 47ms 12 Jun 2025 827th HumanoidCPU 124 445 42ms 1 Nov 2024 827th Shanethegamer 🇺🇸 124 445 53ms 1 Nov 2024 827th CaedenHarper 🇨🇦 124 445 40ms 16 Aug 2025 830th MeWhenI 🇻🇦 124 515 1ms 2 Nov 2024 830th CaedenHarper 🇨🇦 124 515 1ms 12 Nov 2025 830th Shanethegamer 🇺🇸 124 515 1ms 12 Nov 2025 830th HumanoidCPU 124 515 1ms 12 Nov 2025 834th HumanoidCPU 122 518 2ms 1 Nov 2024 834th Shanethegamer 🇺🇸 122 518 2ms 1 Nov 2024 834th MeWhenI 🇻🇦 122 518 2ms 2 Nov 2024 834th CaedenHarper 🇨🇦 122 518 1ms 22 Jan 2025 838th dokutan 121 453 124ms 1 Nov 2024 838th Shanethegamer 🇺🇸 121 453 117ms 1 Nov 2024 838th KatieLG 🇬🇧 121 453 114ms 1 Nov 2024 838th MeWhenI 🇻🇦 121 453 116ms 2 Nov 2024 838th CaedenHarper 🇨🇦 121 453 116ms 24 Jan 2025 843rd KatieLG 🇬🇧 120 461 37ms 18 days ago 844th HumanoidCPU 119 446 8ms 1 Nov 2024 844th dokutan 119 446 9ms 1 Nov 2024 844th KatieLG 🇬🇧 119 446 9ms 1 Nov 2024 844th MeWhenI 🇻🇦 119 446 8ms 2 Nov 2024 844th zakariamouhid 119 446 9ms 17 Nov 2024 844th Salutations45 119 446 8ms 22 Nov 2024 844th gigaprofisi 🇺🇸 119 446 9ms 20 Jun 2025 844th didion0 🇺🇸 119 446 9ms 26 Aug 2025 844th olleicua 🇺🇸 119 446 9ms 10 Sep 2025 853rd iczelia 🇩🇪 119 447 9ms 24 Oct 2025 854th Quadruplay 119 448 8ms 12 Jul 2025 855th HumanoidCPU 117 446 1,005ms 1 Nov 2024 855th Shanethegamer 🇺🇸 117 446 998ms 1 Nov 2024 855th dokutan 117 446 967ms 1 Nov 2024 855th CaedenHarper 🇨🇦 117 446 1,033ms 24 Jan 2025 859th HumanoidCPU 117 448 152ms 1 Nov 2024 859th dokutan 117 448 216ms 1 Nov 2024 859th MeWhenI 🇻🇦 117 448 188ms 2 Nov 2024 859th MarcMush 🇫🇷 117 448 227ms 19 Nov 2024 859th CaedenHarper 🇨🇦 117 448 223ms 1 Feb 2025 864th JOrE20 🇺🇸 116 457 9ms 6 Nov 2025 865th KatieLG 🇬🇧 114 461 780ms 18 days ago 866th KatieLG 🇬🇧 112 467 223ms 18 days ago 867th HumanoidCPU 111 453 50ms 1 Nov 2024 868th MeWhenI 🇻🇦 111 454 52ms 2 Nov 2024 869th CaedenHarper 🇨🇦 109 461 51ms 22 Jan 2025 869th Shanethegamer 🇺🇸 109 461 50ms 6 May 2025 871st KatieLG 🇬🇧 109 463 50ms 1 Nov 2024 872nd HumanoidCPU 106 520 113ms 1 Nov 2024 873rd HumanoidCPU 93 449 32ms 1 Nov 2024 873rd MeWhenI 🇻🇦 93 449 30ms 2 Nov 2024 873rd CaedenHarper 🇨🇦 93 449 36ms 25 Jan 2025 873rd snoozingnewt 🇨🇦 93 449 32ms 14 Sep 2025 877th KatieLG 🇬🇧 93 451 32ms 1 Nov 2024 878th dokutan 91 462 32ms 1 Nov 2024 879th CaedenHarper 🇨🇦 89 882 48ms 25 Jan 2025 880th emgordon154 88 866 1,357ms 22 days ago First Prev 801–880 of 986 Next Last