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 379th xsot 🇸🇬 864 57 23ms 26 Apr 2023 379th Rubiksmath 864 57 11ms 14 Aug 2023 379th bzijlema 🇳🇱 864 57 10ms 15 Nov 2023 379th janbehrens 🇩🇪 864 57 10ms 30 Dec 2023 379th mathisfun271 864 57 10ms 4 Feb 2024 379th thienudomsrirungruang 864 57 10ms 27 Apr 2024 379th Seek64 🇩🇪 864 57 11ms 19 Jun 2024 379th wuzekai518 864 57 10ms 2 Aug 2024 379th bizy-coder 864 57 31ms 14 Aug 2024 379th michaelmgreer 864 57 10ms 9 Oct 2025 411th DaCuteRaccoon 863 54 9ms 9 Dec 2022 412th bitsandbeyond 🇳🇱 861 42 238ms 27 Oct 2025 413th sisyphus-ppcg 🇦🇺 861 56 2ms 12 Jul 2022 414th error256 861 72 62ms 9 days ago 415th DialFrost 🇸🇬 861 76 3ms 14 Sep 2024 416th edsrzf 🇳🇿 859 53 747ms 31 Aug 2025 416th DialFrost 🇸🇬 859 53 800ms 1 Sep 2025 416th xsot 🇸🇬 859 53 849ms 8 hours ago 419th GrayJoKing 🇦🇺 859 96 33ms 18 Jan 2023 419th lynn 859 96 39ms 6 Aug 2023 421st sean-niemann 🇺🇸 857 58 113ms 27 Apr 2024 422nd Irratix 🇳🇱 857 62 2ms 20 Dec 2021 422nd ovs-code 🇩🇪 857 62 2ms 8 May 2023 422nd sean-niemann 🇺🇸 857 62 2ms 18 Dec 2023 425th primo-ppcg 🇹🇭 857 195 11ms 2 Aug 2023 426th MeWhenI 🇻🇦 856 78 443ms 7 Nov 2025 427th inventshah 856 83 60ms 17 Nov 2022 427th ovs-code 🇩🇪 856 83 73ms 3 Jun 2024 427th DialFrost 🇸🇬 856 83 68ms 7 Nov 2025 430th Lydxn 🇨🇦 855 100 25ms 13 Oct 2023 431st Lydxn 🇨🇦 854 63 2ms 15 Jan 2024 431st JayXon 🇺🇸 854 63 4ms 29 Jan 2024 431st rucin93 🇵🇱 854 63 2ms 19 Nov 2025 434th primo-ppcg 🇹🇭 854 78 122ms 27 Mar 2021 434th Shanethegamer 🇺🇸 854 78 125ms 18 Mar 2023 434th Ripick 854 78 172ms 2 Jun 2025 437th sean-niemann 🇺🇸 854 80 95ms 21 Sep 2023 437th Yewzir 🇧🇪 854 80 84ms 16 Nov 2023 439th snoozingnewt 🇨🇦 854 101 126ms 15 days ago 440th Steffan153 🇫🇮 852 77 4ms 1 Nov 2023 441st MeWhenI 🇻🇦 852 84 40ms 29 Apr 2025 442nd Yewzir 🇧🇪 852 130 1,746ms 27 Apr 2024 443rd Shanethegamer 🇺🇸 851 67 3,743ms 27 Oct 2024 443rd pardouin 🇫🇷 851 67 4,270ms 23 Dec 2024 445th kg583 🇺🇸 851 86 9ms 1 Sep 2025 446th ovs-code 🇩🇪 851 138 433ms 17 Feb 2025 447th Espiobest 850 58 10ms 13 Mar 2021 447th fgrosshans 🇫🇷 850 58 12ms 18 Jul 2022 447th MaxElf999 850 58 10ms 3 Oct 2022 447th Alex-x90 🇺🇸 850 58 28ms 23 Mar 2023 447th Natanaelel 🇸🇪 850 58 11ms 11 Apr 2023 447th InigoK 🇺🇸 850 58 28ms 28 May 2023 447th Kacarott 🇦🇺 850 58 28ms 13 Oct 2023 447th m42km 850 58 29ms 25 Nov 2023 447th StefanHabel 🇨🇦 850 58 12ms 20 Apr 2024 447th NickTheEASDude 🇺🇸 850 58 29ms 1 Jul 2024 447th namelessiw 850 58 29ms 27 Jul 2024 447th edsrzf 🇳🇿 850 58 19ms 22 Nov 2024 447th ryyyn 🇺🇸 850 58 27ms 6 Jan 2025 447th croc54 850 58 28ms 9 Jan 2025 447th andrewjc2000 850 58 30ms 11 Mar 2025 447th wuduculfre 850 58 29ms 22 Jul 2025 447th cros107 🇦🇺 850 58 10ms 16 Sep 2025 447th blaztoma 🇱🇹 850 58 29ms 30 Sep 2025 447th robin-scragg 850 58 11ms 21 Oct 2025 466th MeWhenI 🇻🇦 850 70 400ms 21 Nov 2021 467th albanian-laundromat 850 77 9ms 22 Oct 2025 468th MeWhenI 🇻🇦 849 65 6ms 24 Dec 2024 469th ovs-code 🇩🇪 849 73 70ms 17 Sep 2023 470th sisyphus-ppcg 🇦🇺 848 89 118ms 25 Jan 2021 470th Bubbler-4 848 89 115ms 1 Jul 2021 472nd jared-hughes 847 55 9ms 31 Jul 2022 472nd emgordon154 847 55 9ms 4 Mar 2025 474th ovs-code 🇩🇪 847 81 468ms 15 Jun 2024 475th jared-hughes 846 84 64ms 31 Jul 2022 476th Shanethegamer 🇺🇸 845 77 73ms 9 Jun 2022 477th emgordon154 845 131 1,782ms 29 Nov 2024 478th blaztoma 🇱🇹 844 44 3ms 22 Nov 2025 479th dokutan 843 47 5ms 18 Jul 2025 480th Shanethegamer 🇺🇸 843 50 38ms 22 Mar 2023 First Prev 401–480 of 1,870 Next Last