The Calendar hole will go live in approximately 5 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 144 452 319ms 1 Nov 2024 801st Shanethegamer 🇺🇸 144 452 335ms 1 Nov 2024 803rd KatieLG 🇬🇧 142 469 5ms 26 days ago 804th HumanoidCPU 141 446 72ms 1 Nov 2024 804th Shanethegamer 🇺🇸 141 446 73ms 1 Nov 2024 804th MeWhenI 🇻🇦 141 446 79ms 2 Nov 2024 804th snoozingnewt 🇨🇦 141 446 77ms 3 Nov 2024 804th CaedenHarper 🇨🇦 141 446 71ms 16 Aug 2025 809th dokutan 139 452 76ms 1 Nov 2024 810th emgordon154 139 602 1,729ms 12 Dec 2024 811th KatieLG 🇬🇧 138 505 625ms 26 days ago 812th HumanoidCPU 136 575 41ms 9 Mar 2025 813th KatieLG 🇬🇧 135 465 110ms 26 days ago 814th dokutan 134 473 2ms 1 Nov 2024 815th KatieLG 🇬🇧 133 475 1ms 1 Nov 2024 816th dokutan 133 483 1ms 21 Jun 2025 817th dokutan 133 591 40ms 1 Nov 2024 818th KatieLG 🇬🇧 132 487 1ms 26 days ago 819th KatieLG 🇬🇧 131 443 2ms 26 days ago 820th HumanoidCPU 131 444 2ms 1 Nov 2024 820th Shanethegamer 🇺🇸 131 444 3ms 1 Nov 2024 820th dokutan 131 444 2ms 1 Nov 2024 820th MeWhenI 🇻🇦 131 444 2ms 2 Nov 2024 820th CaedenHarper 🇨🇦 131 444 2ms 16 Aug 2025 825th KatieLG 🇬🇧 130 515 2ms 8 Jan 2025 826th KatieLG 🇬🇧 127 530 1ms 1 Nov 2024 827th sciencejiho 127 532 2ms 12 Feb 2025 828th dokutan 126 439 35ms 21 Apr 2025 828th olleicua 🇺🇸 126 439 38ms 12 Jun 2025 830th HumanoidCPU 124 445 38ms 1 Nov 2024 830th Shanethegamer 🇺🇸 124 445 39ms 1 Nov 2024 830th CaedenHarper 🇨🇦 124 445 36ms 16 Aug 2025 833rd MeWhenI 🇻🇦 124 515 1ms 2 Nov 2024 833rd CaedenHarper 🇨🇦 124 515 1ms 12 Nov 2025 833rd Shanethegamer 🇺🇸 124 515 1ms 12 Nov 2025 833rd HumanoidCPU 124 515 1ms 12 Nov 2025 837th HumanoidCPU 122 518 2ms 1 Nov 2024 837th Shanethegamer 🇺🇸 122 518 2ms 1 Nov 2024 837th MeWhenI 🇻🇦 122 518 2ms 2 Nov 2024 837th CaedenHarper 🇨🇦 122 518 1ms 22 Jan 2025 841st dokutan 121 453 124ms 1 Nov 2024 841st Shanethegamer 🇺🇸 121 453 117ms 1 Nov 2024 841st KatieLG 🇬🇧 121 453 114ms 1 Nov 2024 841st MeWhenI 🇻🇦 121 453 116ms 2 Nov 2024 841st CaedenHarper 🇨🇦 121 453 116ms 24 Jan 2025 846th KatieLG 🇬🇧 120 461 36ms 26 days ago 847th HumanoidCPU 119 446 8ms 1 Nov 2024 847th dokutan 119 446 9ms 1 Nov 2024 847th KatieLG 🇬🇧 119 446 9ms 1 Nov 2024 847th MeWhenI 🇻🇦 119 446 8ms 2 Nov 2024 847th zakariamouhid 119 446 9ms 17 Nov 2024 847th Salutations45 119 446 8ms 22 Nov 2024 847th gigaprofisi 🇺🇸 119 446 9ms 20 Jun 2025 847th didion0 🇺🇸 119 446 9ms 26 Aug 2025 847th olleicua 🇺🇸 119 446 9ms 10 Sep 2025 856th iczelia 🇩🇪 119 447 9ms 24 Oct 2025 857th Quadruplay 119 448 8ms 12 Jul 2025 858th HumanoidCPU 117 446 1,005ms 1 Nov 2024 858th Shanethegamer 🇺🇸 117 446 998ms 1 Nov 2024 858th dokutan 117 446 967ms 1 Nov 2024 858th CaedenHarper 🇨🇦 117 446 1,033ms 24 Jan 2025 862nd HumanoidCPU 117 448 152ms 1 Nov 2024 862nd dokutan 117 448 216ms 1 Nov 2024 862nd MeWhenI 🇻🇦 117 448 188ms 2 Nov 2024 862nd MarcMush 🇫🇷 117 448 155ms 19 Nov 2024 862nd CaedenHarper 🇨🇦 117 448 151ms 1 Feb 2025 867th JOrE20 🇺🇸 117 457 9ms 6 Nov 2025 868th KatieLG 🇬🇧 114 461 780ms 26 days ago 869th KatieLG 🇬🇧 112 467 184ms 26 days ago 870th HumanoidCPU 111 453 50ms 1 Nov 2024 871st MeWhenI 🇻🇦 111 454 52ms 2 Nov 2024 872nd CaedenHarper 🇨🇦 109 461 51ms 22 Jan 2025 872nd Shanethegamer 🇺🇸 109 461 50ms 6 May 2025 874th KatieLG 🇬🇧 109 463 50ms 1 Nov 2024 875th HumanoidCPU 106 520 113ms 1 Nov 2024 876th HumanoidCPU 93 449 32ms 1 Nov 2024 876th MeWhenI 🇻🇦 93 449 30ms 2 Nov 2024 876th CaedenHarper 🇨🇦 93 449 36ms 25 Jan 2025 876th snoozingnewt 🇨🇦 93 449 32ms 14 Sep 2025 880th KatieLG 🇬🇧 93 451 32ms 1 Nov 2024 First Prev 801–880 of 989 Next Last