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 480th MeWhenI 🇻🇦 843 50 36ms 22 Mar 2023 482nd Steffan153 🇫🇮 843 63 2ms 23 Mar 2023 482nd stefangimmillaro 843 63 2ms 18 Sep 2023 482nd xsot 🇸🇬 843 63 2ms 6 May 2025 482nd KasperKivimaeki 🇫🇮 843 63 2ms 14 Aug 2025 486th MeWhenI 🇻🇦 842 57 403ms 17 Jan 2024 486th SirBogman 🇺🇸 842 57 471ms 10 Jun 2024 486th CaedenHarper 🇨🇦 842 57 406ms 12 days ago 489th MeWhenI 🇻🇦 842 76 37ms 16 Jun 2022 490th btnlq 841 43 246ms 26 Jan 2021 490th primo-ppcg 🇹🇭 841 43 243ms 25 May 2021 492nd primo-ppcg 🇹🇭 841 87 29ms 25 Jan 2023 493rd fuzzylojik-golf 🇺🇸 840 22 3ms 6 Sep 2025 494th acotis 839 90 126ms 3 Oct 2025 495th primo-ppcg 🇹🇭 836 85 58ms 18 Jan 2022 495th 09cf 836 85 71ms 24 Sep 2023 497th marcin7Cd 835 59 10ms 16 Jan 2021 497th AlephSquirrel 835 59 10ms 13 May 2021 497th rschwa6308 🇺🇸 835 59 10ms 28 Jun 2021 497th NewDefectus 🇮🇱 835 59 13ms 25 Oct 2021 497th jacksonhenry3 835 59 13ms 21 Dec 2021 497th NicoAdams 835 59 14ms 21 Dec 2021 497th yzhs 🇩🇪 835 59 10ms 7 Jun 2022 497th aksyristos 835 59 11ms 28 Feb 2023 497th BREMAUCY 🇫🇷 835 59 11ms 27 Apr 2023 497th MarcMush 🇫🇷 835 59 10ms 12 Feb 2024 507th GrayJoKing 🇦🇺 833 57 36ms 5 Sep 2024 508th MeWhenI 🇻🇦 832 56 9ms 8 Jun 2022 508th Yewzir 🇧🇪 832 56 9ms 16 Nov 2023 508th voytxt 🇨🇿 832 56 9ms 25 Jan 2025 508th targrik 832 56 9ms 21 Feb 2025 512th sean-niemann 🇺🇸 832 77 41ms 18 Dec 2023 513th kritixilithos 831 58 3ms 29 May 2024 514th primo-ppcg 🇹🇭 831 77 1,312ms 30 Nov 2021 515th inventshah 830 64 2ms 17 Nov 2022 515th DialFrost 🇸🇬 830 64 2ms 7 Nov 2025 517th sisyphus-ppcg 🇦🇺 829 60 118ms 25 Feb 2021 518th Kacarott 🇦🇺 828 58 342ms 15 Jan 2024 518th Natanaelel 🇸🇪 828 58 355ms 20 Jan 2024 518th AlephSquirrel 828 58 420ms 21 Jan 2024 518th namelessiw 828 58 402ms 15 Aug 2024 522nd Irratix 🇳🇱 827 51 35ms 4 Mar 2022 523rd GrayJoKing 🇦🇺 827 65 4ms 9 Nov 2023 524th m-ender 🇩🇪 827 89 153ms 23 Apr 2021 525th Yewzir 🇧🇪 826 83 371ms 16 Nov 2023 526th MeWhenI 🇻🇦 825 104 267ms 8 Feb 2023 527th MeWhenI 🇻🇦 824 78 98ms 14 Oct 2022 528th Shanethegamer 🇺🇸 823 83 83ms 19 Apr 2022 529th GrayJoKing 🇦🇺 822 81 120ms 14 Mar 2022 529th MeWhenI 🇻🇦 822 81 121ms 15 Nov 2022 531st AGoyet 821 60 12ms 29 Jun 2022 531st betaveros 821 60 18ms 31 Dec 2022 531st AlexanderFair 821 60 10ms 23 Jun 2023 531st Andriamanitra 🇫🇮 821 60 13ms 20 Jul 2023 531st dranjohn 821 60 49ms 15 Sep 2023 531st inverseLorentz 🇦🇺 821 60 10ms 9 Apr 2024 531st 051 🇸🇬 821 60 14ms 1 Aug 2024 531st KasperKivimaeki 🇫🇮 821 60 11ms 30 Jun 2025 531st vgamula 🇺🇦 821 60 31ms 28 Jul 2025 531st LuisGoncalves05 🇵🇹 821 60 10ms 29 Jul 2025 531st luuumine 🇫🇷 821 60 11ms 20 Oct 2025 542nd emgordon154 821 105 101ms 17 days ago 543rd NewDefectus 🇮🇱 818 57 9ms 1 Nov 2021 544th inventshah 817 59 2ms 18 May 2022 544th MeWhenI 🇻🇦 817 59 2ms 18 May 2022 546th prplz 🇦🇺 817 65 2ms 24 Jan 2021 546th sisyphus-ppcg 🇦🇺 817 65 2ms 25 Jan 2021 546th 09cf 817 65 2ms 24 Sep 2023 549th m-tkach 🇺🇦 817 101 28ms 18 Jan 2024 550th MeWhenI 🇻🇦 816 29 49ms 25 Aug 2022 551st ovs-code 🇩🇪 816 52 134ms 4 Aug 2024 552nd GrayJoKing 🇦🇺 816 84 462ms 28 Feb 2022 553rd MeWhenI 🇻🇦 815 27 33ms 16 Mar 2022 554th Yewzir 🇧🇪 815 61 105ms 16 Nov 2023 555th ovs-code 🇩🇪 815 66 2ms 10 Oct 2023 555th inventshah 815 66 2ms 22 Oct 2023 557th BREMAUCY 🇫🇷 814 59 425ms 20 Feb 2024 558th duckyluuk 🇳🇱 814 70 4,078ms 28 Oct 2024 559th janlelis 811 52 38ms 18 Jan 2021 559th hiddicop 🇸🇪 811 52 37ms 29 Jan 2021 First Prev 481–560 of 1,871 Next Last