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 321st DialFrost 🇸🇬 880 52 244ms 7 Jan 2024 321st Steffan153 🇫🇮 880 52 200ms 26 Feb 2024 321st sean-niemann 🇺🇸 880 52 242ms 27 Jun 2025 324th schachmattmatt 880 56 11ms 18 Aug 2021 324th MeWhenI 🇻🇦 880 56 32ms 22 Oct 2021 324th Irratix 🇳🇱 880 56 11ms 19 Apr 2022 324th tri1212 🇻🇳 880 56 11ms 18 Jul 2022 324th fredrik-bakke 🇳🇴 880 56 11ms 29 Sep 2022 324th neel11235813 880 56 30ms 21 Dec 2022 324th sisyphus-ppcg 🇦🇺 880 56 24ms 23 Mar 2023 324th elgan65536 880 56 10ms 31 Mar 2024 324th HETHAT 🇩🇿 880 56 10ms 12 Apr 2024 324th wh3n3v3r 🇨🇿 880 56 11ms 12 Nov 2024 324th plcc0 880 56 18ms 19 Mar 2025 335th JayXon 🇺🇸 880 73 98ms 15 Oct 2022 335th Steffan153 🇫🇮 880 73 97ms 7 Dec 2022 335th sean-niemann 🇺🇸 880 73 98ms 20 May 2024 338th tomtheisen 🇺🇸 879 53 9ms 18 Jan 2021 338th prplz 🇦🇺 879 53 9ms 24 Jan 2021 338th jakzo 879 53 9ms 5 Sep 2021 338th ovs-code 🇩🇪 879 53 9ms 5 Oct 2023 338th dokutan 879 53 9ms 18 Jul 2025 343rd Steffan153 🇫🇮 879 54 8ms 18 Aug 2024 344th GrayJoKing 🇦🇺 879 74 96ms 6 Jun 2023 344th Steffan153 🇫🇮 879 74 110ms 18 Aug 2024 346th namelessiw 879 76 551ms 2 Oct 2025 346th Yewzir 🇧🇪 879 76 677ms 2 Oct 2025 348th Steffan153 🇫🇮 878 94 48ms 18 Jan 2023 349th GrayJoKing 🇦🇺 877 73 41ms 27 Jun 2022 349th primo-ppcg 🇹🇭 877 73 40ms 28 Jun 2022 351st Steffan153 🇫🇮 877 81 75ms 23 Mar 2023 351st sean-niemann 🇺🇸 877 81 58ms 23 Sep 2023 353rd m-tkach 🇺🇦 877 107 16ms 17 May 2022 354th GrayJoKing 🇦🇺 876 27 54ms 2 Aug 2022 355th saito-ta 🇯🇵 876 55 3ms 26 May 2022 355th nwellnhof 🇩🇪 876 55 3ms 13 May 2023 357th GrayJoKing 🇦🇺 876 63 7ms 31 Jan 2025 358th emplv 🇱🇻 876 98 273ms 18 Jan 2022 358th stefangimmillaro 876 98 318ms 21 Jun 2023 360th Irratix 🇳🇱 875 68 335ms 13 Dec 2021 360th namelessiw 875 68 362ms 18 Jul 2025 362nd zacjl 875 72 41ms 13 Feb 2025 363rd primo-ppcg 🇹🇭 875 78 4ms 2 May 2023 364th m-tkach 🇺🇦 873 55 374ms 20 Jan 2024 364th neel11235813 873 55 374ms 29 Mar 2024 366th stefangimmillaro 873 82 39ms 26 Apr 2025 367th primo-ppcg 🇹🇭 872 57 119ms 1 May 2023 368th jared-hughes 872 126 15ms 7 Jul 2024 369th JayXon 🇺🇸 872 127 1,725ms 22 Apr 2024 370th Steffan153 🇫🇮 868 79 405ms 23 Mar 2023 370th DialFrost 🇸🇬 868 79 365ms 7 Nov 2025 372nd btjones0 868 87 119ms 26 Jan 2021 372nd lynn 868 87 117ms 7 Jul 2024 374th Irratix 🇳🇱 867 82 58ms 18 Dec 2022 375th MeWhenI 🇻🇦 866 85 11ms 30 Oct 2021 376th stefangimmillaro 865 79 97ms 21 Jun 2023 377th janbehrens 🇩🇪 864 43 3ms 18 Jan 2021 378th Shanethegamer 🇺🇸 864 53 1,128ms 23 May 2021 378th MeWhenI 🇻🇦 864 53 996ms 16 Mar 2022 380th primo-ppcg 🇹🇭 864 57 10ms 18 Jan 2021 380th prplz 🇦🇺 864 57 12ms 21 Jan 2021 380th OllieBoyne 🇬🇧 864 57 10ms 22 Jan 2021 380th hiddicop 🇸🇪 864 57 11ms 29 Jan 2021 380th lynn 864 57 13ms 6 Mar 2021 380th vezzick 864 57 10ms 8 Mar 2021 380th kops-cg 864 57 11ms 8 Apr 2021 380th clementblaudeau 864 57 12ms 1 Jun 2021 380th jared-hughes 864 57 11ms 14 Aug 2021 380th michelebastione 🇮🇹 864 57 12ms 16 Aug 2021 380th Indivicivet 864 57 10ms 26 Oct 2021 380th bricknellj 864 57 11ms 14 Jan 2022 380th scpchicken 🇵🇼 864 57 10ms 12 Mar 2022 380th pascscha 864 57 12ms 28 Apr 2022 380th jgygax 864 57 12ms 28 Apr 2022 380th stefangimmillaro 864 57 10ms 13 May 2022 380th ZakkkkAttackkkk 🇵🇭 864 57 15ms 31 Jul 2022 380th inventshah 864 57 10ms 19 Sep 2022 380th LogicalJoe 864 57 10ms 19 Sep 2022 380th lzahray 864 57 31ms 21 Oct 2022 380th thehylian 864 57 10ms 10 Jan 2023 First Prev 321–400 of 1,872 Next Last