The Calendar hole will go live in approximately 9 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 380th 5cw 🇺🇸 864 57 10ms 10 Apr 2023 380th xsot 🇸🇬 864 57 23ms 26 Apr 2023 380th Rubiksmath 864 57 11ms 14 Aug 2023 380th bzijlema 🇳🇱 864 57 10ms 15 Nov 2023 380th janbehrens 🇩🇪 864 57 10ms 30 Dec 2023 380th mathisfun271 864 57 10ms 4 Feb 2024 380th thienudomsrirungruang 864 57 10ms 27 Apr 2024 380th Seek64 🇩🇪 864 57 11ms 19 Jun 2024 380th wuzekai518 864 57 10ms 2 Aug 2024 380th bizy-coder 864 57 31ms 14 Aug 2024 380th michaelmgreer 864 57 10ms 9 Oct 2025 412th DaCuteRaccoon 863 54 9ms 9 Dec 2022 413th bitsandbeyond 🇳🇱 861 42 238ms 27 Oct 2025 414th sisyphus-ppcg 🇦🇺 861 56 2ms 12 Jul 2022 415th error256 861 72 62ms 11 days ago 416th DialFrost 🇸🇬 861 76 3ms 14 Sep 2024 417th edsrzf 🇳🇿 859 53 747ms 31 Aug 2025 417th DialFrost 🇸🇬 859 53 800ms 1 Sep 2025 417th xsot 🇸🇬 859 53 849ms 44 hours ago 420th GrayJoKing 🇦🇺 859 96 33ms 18 Jan 2023 420th lynn 859 96 39ms 6 Aug 2023 422nd sean-niemann 🇺🇸 857 58 113ms 27 Apr 2024 423rd Irratix 🇳🇱 857 62 2ms 20 Dec 2021 423rd ovs-code 🇩🇪 857 62 2ms 8 May 2023 423rd sean-niemann 🇺🇸 857 62 2ms 18 Dec 2023 426th primo-ppcg 🇹🇭 857 195 11ms 2 Aug 2023 427th MeWhenI 🇻🇦 856 78 443ms 7 Nov 2025 428th inventshah 856 83 60ms 17 Nov 2022 428th ovs-code 🇩🇪 856 83 73ms 3 Jun 2024 428th DialFrost 🇸🇬 856 83 68ms 7 Nov 2025 431st Lydxn 🇨🇦 855 100 25ms 13 Oct 2023 432nd Lydxn 🇨🇦 854 63 2ms 15 Jan 2024 432nd JayXon 🇺🇸 854 63 4ms 29 Jan 2024 432nd rucin93 🇵🇱 854 63 2ms 19 Nov 2025 435th primo-ppcg 🇹🇭 854 78 122ms 27 Mar 2021 435th Shanethegamer 🇺🇸 854 78 125ms 18 Mar 2023 435th Ripick 854 78 172ms 2 Jun 2025 438th sean-niemann 🇺🇸 854 80 95ms 21 Sep 2023 438th Yewzir 🇧🇪 854 80 84ms 16 Nov 2023 440th snoozingnewt 🇨🇦 854 101 126ms 17 days ago 441st Steffan153 🇫🇮 852 77 4ms 1 Nov 2023 442nd MeWhenI 🇻🇦 852 84 40ms 29 Apr 2025 443rd Yewzir 🇧🇪 852 130 1,746ms 27 Apr 2024 444th Shanethegamer 🇺🇸 851 67 3,743ms 27 Oct 2024 444th pardouin 🇫🇷 851 67 4,270ms 23 Dec 2024 446th kg583 🇺🇸 851 86 9ms 1 Sep 2025 447th ovs-code 🇩🇪 851 138 433ms 17 Feb 2025 448th Espiobest 850 58 10ms 13 Mar 2021 448th fgrosshans 🇫🇷 850 58 12ms 18 Jul 2022 448th MaxElf999 850 58 10ms 3 Oct 2022 448th Alex-x90 🇺🇸 850 58 28ms 23 Mar 2023 448th Natanaelel 🇸🇪 850 58 11ms 11 Apr 2023 448th InigoK 🇺🇸 850 58 28ms 28 May 2023 448th Kacarott 🇦🇺 850 58 28ms 13 Oct 2023 448th m42km 850 58 29ms 25 Nov 2023 448th StefanHabel 🇨🇦 850 58 12ms 20 Apr 2024 448th NickTheEASDude 🇺🇸 850 58 29ms 1 Jul 2024 448th namelessiw 850 58 29ms 27 Jul 2024 448th edsrzf 🇳🇿 850 58 19ms 22 Nov 2024 448th ryyyn 🇺🇸 850 58 27ms 6 Jan 2025 448th croc54 850 58 28ms 9 Jan 2025 448th andrewjc2000 850 58 30ms 11 Mar 2025 448th wuduculfre 850 58 29ms 22 Jul 2025 448th cros107 🇦🇺 850 58 10ms 16 Sep 2025 448th blaztoma 🇱🇹 850 58 29ms 30 Sep 2025 448th robin-scragg 850 58 11ms 21 Oct 2025 467th MeWhenI 🇻🇦 850 70 400ms 21 Nov 2021 468th albanian-laundromat 850 77 9ms 22 Oct 2025 469th MeWhenI 🇻🇦 849 65 6ms 24 Dec 2024 470th ovs-code 🇩🇪 849 73 70ms 17 Sep 2023 471st sisyphus-ppcg 🇦🇺 848 89 118ms 25 Jan 2021 471st Bubbler-4 848 89 115ms 1 Jul 2021 473rd jared-hughes 847 55 9ms 31 Jul 2022 473rd emgordon154 847 55 9ms 4 Mar 2025 475th ovs-code 🇩🇪 847 81 468ms 15 Jun 2024 476th jared-hughes 846 84 64ms 31 Jul 2022 477th Shanethegamer 🇺🇸 845 77 73ms 9 Jun 2022 478th emgordon154 845 131 1,782ms 29 Nov 2024 479th blaztoma 🇱🇹 844 44 3ms 22 Nov 2025 480th dokutan 843 47 5ms 18 Jul 2025 First Prev 401–480 of 1,872 Next Last