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 chars. 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 Chars Time Submitted 800th zbreit 🇺🇸 137 452 9ms 1 Nov 2024 800th Shanethegamer 🇺🇸 137 452 9ms 1 Nov 2024 800th madex 🇩🇪 137 452 9ms 1 Nov 2024 800th jtaxen 137 452 9ms 1 Nov 2024 800th Stockoh 🇫🇷 137 452 9ms 4 Nov 2024 800th evan18c 137 452 9ms 7 Nov 2024 800th roguh 🇬🇹 137 452 9ms 27 Nov 2024 800th mathisfun271 137 452 10ms 25 Jan 2025 800th moustave 137 452 9ms 9 Apr 2025 800th SectorCorruptor 137 452 9ms 24 Jul 2025 800th vgamula 🇺🇦 137 452 9ms 25 Jul 2025 800th Unknownuserfrommars 137 452 9ms 5 Aug 2025 800th JOrE20 🇺🇸 137 452 9ms 6 Nov 2025 814th dokutan 136 273 3ms 13 Nov 2024 815th KasperKivimaeki 🇫🇮 136 457 9ms 15 Jul 2025 816th HumanoidCPU 136 575 41ms 9 Mar 2025 817th Upload-and-View 🇺🇦 135 458 9ms 9 Aug 2025 818th KatieLG 🇬🇧 135 465 110ms 18 days ago 819th Shanethegamer 🇺🇸 134 452 335ms 1 Nov 2024 820th dokutan 134 473 2ms 1 Nov 2024 821st KatieLG 🇬🇧 133 475 1ms 1 Nov 2024 822nd KatieLG 🇬🇧 132 487 1ms 18 days ago 823rd KatieLG 🇬🇧 131 443 2ms 18 days ago 824th HumanoidCPU 131 444 2ms 1 Nov 2024 824th Shanethegamer 🇺🇸 131 444 3ms 1 Nov 2024 824th dokutan 131 444 2ms 1 Nov 2024 824th MeWhenI 🇻🇦 131 444 2ms 2 Nov 2024 824th CaedenHarper 🇨🇦 131 444 2ms 16 Aug 2025 829th KatieLG 🇬🇧 130 515 1ms 8 Jan 2025 830th KatieLG 🇬🇧 127 530 1ms 1 Nov 2024 831st sciencejiho 127 532 2ms 12 Feb 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 Shanethegamer 🇺🇸 122 445 53ms 1 Nov 2024 836th CaedenHarper 🇨🇦 122 445 40ms 16 Aug 2025 838th HumanoidCPU 122 518 2ms 1 Nov 2024 838th Shanethegamer 🇺🇸 122 518 2ms 1 Nov 2024 838th MeWhenI 🇻🇦 122 518 2ms 2 Nov 2024 838th CaedenHarper 🇨🇦 122 518 1ms 22 Jan 2025 842nd HumanoidCPU 119 446 8ms 1 Nov 2024 842nd MeWhenI 🇻🇦 119 446 8ms 2 Nov 2024 842nd zakariamouhid 119 446 9ms 17 Nov 2024 842nd Salutations45 119 446 8ms 22 Nov 2024 842nd gigaprofisi 🇺🇸 119 446 9ms 20 Jun 2025 842nd didion0 🇺🇸 119 446 9ms 26 Aug 2025 842nd olleicua 🇺🇸 119 446 9ms 10 Sep 2025 849th iczelia 🇩🇪 119 447 9ms 24 Oct 2025 850th Quadruplay 119 448 8ms 12 Jul 2025 851st HumanoidCPU 117 446 1,005ms 1 Nov 2024 851st Shanethegamer 🇺🇸 117 446 998ms 1 Nov 2024 851st dokutan 117 446 967ms 1 Nov 2024 851st CaedenHarper 🇨🇦 117 446 1,033ms 24 Jan 2025 855th JOrE20 🇺🇸 116 457 9ms 6 Nov 2025 856th KatieLG 🇬🇧 114 461 780ms 18 days ago 857th HumanoidCPU 113 448 152ms 1 Nov 2024 857th MeWhenI 🇻🇦 113 448 188ms 2 Nov 2024 857th CaedenHarper 🇨🇦 113 448 223ms 1 Feb 2025 860th dokutan 110 453 124ms 1 Nov 2024 860th Shanethegamer 🇺🇸 110 453 117ms 1 Nov 2024 860th KatieLG 🇬🇧 110 453 114ms 1 Nov 2024 860th MeWhenI 🇻🇦 110 453 116ms 2 Nov 2024 860th CaedenHarper 🇨🇦 110 453 116ms 24 Jan 2025 865th KatieLG 🇬🇧 110 1,387 4ms 1 Nov 2024 866th KatieLG 🇬🇧 109 467 223ms 18 days ago 867th HumanoidCPU 96 520 113ms 1 Nov 2024 868th HumanoidCPU 93 449 32ms 1 Nov 2024 868th MeWhenI 🇻🇦 93 449 30ms 2 Nov 2024 868th CaedenHarper 🇨🇦 93 449 36ms 25 Jan 2025 868th snoozingnewt 🇨🇦 93 449 32ms 14 Sep 2025 872nd KatieLG 🇬🇧 93 451 32ms 1 Nov 2024 873rd dokutan 91 462 32ms 1 Nov 2024 874th CaedenHarper 🇨🇦 89 882 48ms 25 Jan 2025 875th emgordon154 88 866 1,357ms 22 days ago 876th CaedenHarper 🇨🇦 85 1,015 2ms 22 Jan 2025 877th MeWhenI 🇻🇦 84 439 2ms 2 Nov 2024 877th CaedenHarper 🇨🇦 84 439 2ms 16 Aug 2025 879th HumanoidCPU 83 444 2ms 1 Nov 2024 880th KatieLG 🇬🇧 72 511 2ms 1 Nov 2024 First Prev 801–880 of 981 Next Last