The Calendar hole will go live in approximately 10 days. Why not try and solve it ahead of time?
Kolakoski Sequence 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 721st ArmaanAS 747 66 11ms 4 Apr 2021 721st quimey 747 66 11ms 23 Jun 2023 721st solisolu 747 66 19ms 27 Oct 2025 724th sean-niemann 🇺🇸 744 57 133ms 17 Jun 2025 725th primo-ppcg 🇹🇭 743 40 199ms 22 Apr 2022 726th ScottHamper 742 90 446ms 21 days ago 727th kg583 🇺🇸 741 85 48ms 13 Feb 2025 728th jared-hughes 740 57 36ms 9 Sep 2022 729th olivermrose 🇺🇸 740 63 9ms 21 Sep 2021 729th GeorgeStechman 🇬🇧 740 63 9ms 17 Nov 2022 731st SirBogman 🇺🇸 740 139 2ms 21 Dec 2021 732nd emgordon154 739 32 53ms 19 Oct 2025 733rd AlephSquirrel 739 99 10ms 18 Jan 2025 733rd edsrzf 🇳🇿 739 99 36ms 7 days ago 735th DialFrost 🇸🇬 738 49 268ms 25 Jun 2024 736th janbehrens 🇩🇪 737 93 464ms 24 Mar 2022 737th Yewzir 🇧🇪 735 62 739ms 16 Nov 2025 738th msbranicky 735 67 15ms 21 Aug 2023 739th MeWhenI 🇻🇦 734 93 4ms 22 May 2023 740th guliyevemil1 🇦🇿 733 89 124ms 11 Feb 2021 740th annaproxy 733 89 148ms 17 Aug 2022 740th Shanethegamer 🇺🇸 733 89 116ms 20 Jan 2024 740th snoozingnewt 🇨🇦 733 89 118ms 11 days ago 744th Omega65536 🇩🇪 733 103 131ms 24 Nov 2022 745th MeWhenI 🇻🇦 733 151 1,682ms 7 Nov 2025 746th primo-ppcg 🇹🇭 731 117 25ms 14 Jul 2021 747th Shanethegamer 🇺🇸 730 88 97ms 15 Oct 2022 748th dvik72 728 64 9ms 1 Jun 2022 748th AlephSquirrel 728 64 9ms 16 Feb 2023 750th janbehrens 🇩🇪 728 73 2ms 11 Jun 2021 751st annaproxy 727 58 38ms 24 Oct 2023 752nd KatieLG 🇬🇧 727 63 812ms 25 Apr 2021 753rd arctouch-cristiannevianna 726 82 336ms 22 Nov 2023 754th Stockoh 🇫🇷 725 68 34ms 25 Dec 2021 754th Bonjour27891 🇻🇳 725 68 34ms 1 Sep 2022 754th trist224 🇫🇷 725 68 37ms 18 Oct 2022 754th mousetail 🇳🇱 725 68 35ms 11 Aug 2023 754th Command-Master 725 68 39ms 24 Sep 2023 754th firegene 🇮🇪 725 68 36ms 12 Oct 2024 754th JunkIce 725 68 17ms 24 Nov 2024 761st ovs-code 🇩🇪 725 72 12ms 16 Jul 2023 762nd yzhs 🇩🇪 725 90 117ms 24 Jul 2021 763rd dokutan 724 118 25ms 18 Jul 2025 764th jacobly0 🇺🇸 724 153 1,809ms 22 Apr 2024 765th primo-ppcg 🇹🇭 720 47 28ms 5 Feb 2022 766th Yewzir 🇧🇪 719 91 2ms 28 Mar 2024 767th Shanethegamer 🇺🇸 718 74 2ms 18 May 2022 768th edsrzf 🇳🇿 718 95 6ms 24 Nov 2024 769th Alex-x90 🇺🇸 718 99 403ms 23 Jun 2022 770th GolfingSuccess 🇬🇷 717 33 48ms 22 Jul 2022 771st igmcdowell 717 65 10ms 23 Nov 2021 772nd MeWhenI 🇻🇦 717 75 8ms 9 Oct 2023 773rd prplz 🇦🇺 717 91 118ms 25 Jan 2021 774th msbranicky 716 67 576ms 17 Jan 2024 775th marshallward 🇺🇸 716 100 41ms 7 May 2025 776th tatzyr 🇯🇵 715 59 46ms 29 Dec 2024 777th NewDefectus 🇮🇱 714 21 2ms 14 Jan 2022 778th prplz 🇦🇺 714 52 3ms 5 Feb 2021 779th abailey2020 🇺🇸 714 69 10ms 19 Feb 2021 779th Anonymousellama21 714 69 11ms 15 May 2022 779th TaserTheFox 🇺🇸 714 69 36ms 16 Feb 2023 779th Jacob385 714 69 44ms 22 Apr 2024 783rd CaedenHarper 🇨🇦 712 64 766ms 6 Oct 2025 784th emgordon154 712 80 3,639ms 9 Aug 2025 785th elgan65536 712 106 147ms 26 Oct 2023 786th MeWhenI 🇻🇦 711 90 1,287ms 14 Jun 2023 787th marcin7Cd 710 103 21ms 12 Feb 2021 788th Feniske 🇫🇷 709 51 255ms 21 Nov 2023 789th chordowl 709 92 116ms 17 Mar 2021 790th CaedenHarper 🇨🇦 708 84 380ms 17 Oct 2025 791st aadenboy 🇺🇸 708 86 3ms 4 days ago 792nd rucin93 🇵🇱 707 60 127ms 9 Aug 2024 793rd omurakazuaki 🇯🇵 706 66 9ms 18 Feb 2021 793rd BambooleanLogic 🇸🇪 706 66 9ms 22 Aug 2022 793rd coreynash 706 66 9ms 21 Oct 2023 793rd two-bad 🇬🇧 706 66 9ms 24 Nov 2023 793rd dylanarmstrong 706 66 9ms 15 Jan 2024 793rd madeforlosers 706 66 9ms 5 Nov 2025 799th Stockoh 🇫🇷 706 68 357ms 24 Jun 2024 799th JunkIce 706 68 348ms 3 Dec 2024 First Prev 721–800 of 1,871 Next Last