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 bytes. 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 Bytes Time Submitted 238th Steffan153 🇫🇮 889 45 2ms 11 Apr 2023 238th DialFrost 🇸🇬 889 45 2ms 21 Dec 2024 243rd Shanethegamer 🇺🇸 889 72 1,311ms 19 Jan 2025 244th prplz 🇦🇺 888 69 336ms 21 Nov 2021 244th DialFrost 🇸🇬 888 69 374ms 7 Nov 2025 246th Lydxn 🇨🇦 888 75 125ms 12 Jul 2021 247th Steffan153 🇫🇮 888 81 75ms 23 Mar 2023 247th sean-niemann 🇺🇸 888 81 58ms 23 Sep 2023 249th JayXon 🇺🇸 887 77 93ms 19 Feb 2021 250th Kacarott 🇦🇺 886 70 60ms 12 days ago 250th GrayJoKing 🇦🇺 886 70 62ms 12 days ago 252nd GrayJoKing 🇦🇺 885 59 12ms 8 Aug 2023 253rd zacjl 885 71 9ms 21 Oct 2024 254th inventshah 885 74 9ms 19 Sep 2022 255th DialFrost 🇸🇬 885 99 271ms 7 Nov 2025 256th o0lit3 🇺🇸 884 42 2ms 13 Jun 2022 256th DaCuteRaccoon 884 42 4ms 9 Dec 2022 256th DialFrost 🇸🇬 884 42 4ms 1 Feb 2023 256th MeWhenI 🇻🇦 884 42 3ms 16 Apr 2023 256th nwellnhof 🇩🇪 884 42 3ms 29 May 2023 256th xsot 🇸🇬 884 42 4ms 27 Jun 2025 262nd primo-ppcg 🇹🇭 884 81 39ms 2 May 2025 263rd GrayJoKing 🇦🇺 883 69 1ms 9 Apr 2022 264th clockworknazo 883 83 17ms 26 Sep 2022 264th GrayJoKing 🇦🇺 883 83 16ms 12 Feb 2023 266th razetime 882 17 2ms 12 Jan 2022 267th DialFrost 🇸🇬 882 74 116ms 28 Apr 2025 268th sisyphus-ppcg 🇦🇺 881 45 5ms 17 Jan 2021 268th Lydxn 🇨🇦 881 45 5ms 17 Jan 2021 268th emplv 🇱🇻 881 45 5ms 17 Jan 2021 268th GrayJoKing 🇦🇺 881 45 5ms 21 Sep 2021 268th DaCuteRaccoon 881 45 5ms 9 Dec 2022 268th DialFrost 🇸🇬 881 45 6ms 1 Feb 2023 268th janbehrens 🇩🇪 881 45 5ms 16 May 2023 275th GrayJoKing 🇦🇺 881 57 10ms 17 Jan 2021 275th btjones0 881 57 10ms 17 Jan 2021 275th hallvabo 🇳🇴 881 57 11ms 18 Jan 2021 275th TFeld00 🇩🇰 881 57 13ms 18 Jan 2021 275th primo-ppcg 🇹🇭 881 57 10ms 18 Jan 2021 275th prplz 🇦🇺 881 57 12ms 21 Jan 2021 275th OllieBoyne 🇬🇧 881 57 10ms 22 Jan 2021 275th KatieLG 🇬🇧 881 57 10ms 23 Jan 2021 275th hiddicop 🇸🇪 881 57 11ms 29 Jan 2021 275th anter69 🇭🇺 881 57 11ms 3 Feb 2021 275th lynn 881 57 13ms 6 Mar 2021 275th kops-cg 881 57 11ms 8 Apr 2021 275th clementblaudeau 881 57 12ms 1 Jun 2021 275th orthoplex 🇨🇽 881 57 13ms 29 Jul 2021 275th jared-hughes 881 57 11ms 14 Aug 2021 275th michelebastione 🇮🇹 881 57 12ms 16 Aug 2021 275th RYNO8 881 57 10ms 4 Sep 2021 275th Indivicivet 881 57 10ms 26 Oct 2021 275th annaproxy 881 57 10ms 8 Dec 2021 275th Fishron 881 57 12ms 22 Dec 2021 275th MeWhenI 🇻🇦 881 57 10ms 25 Dec 2021 275th bricknellj 881 57 11ms 14 Jan 2022 275th scpchicken 🇵🇼 881 57 10ms 12 Mar 2022 275th pascscha 881 57 12ms 28 Apr 2022 275th jgygax 881 57 12ms 28 Apr 2022 275th stefangimmillaro 881 57 10ms 13 May 2022 275th inventshah 881 57 10ms 19 Sep 2022 275th LogicalJoe 881 57 10ms 19 Sep 2022 275th lzahray 881 57 31ms 21 Oct 2022 275th thehylian 881 57 10ms 10 Jan 2023 275th 5cw 🇺🇸 881 57 10ms 10 Apr 2023 275th xsot 🇸🇬 881 57 23ms 26 Apr 2023 275th Rubiksmath 881 57 11ms 14 Aug 2023 275th kg583 🇺🇸 881 57 24ms 26 Sep 2023 275th bzijlema 🇳🇱 881 57 10ms 15 Nov 2023 275th janbehrens 🇩🇪 881 57 10ms 30 Dec 2023 275th mathisfun271 881 57 10ms 4 Feb 2024 275th duckyluuk 🇳🇱 881 57 24ms 6 Feb 2024 275th Yewzir 🇧🇪 881 57 12ms 29 Feb 2024 275th elgan65536 881 57 10ms 4 Apr 2024 275th thienudomsrirungruang 881 57 10ms 27 Apr 2024 275th SirBogman 🇺🇸 881 57 13ms 10 Jun 2024 275th Seek64 🇩🇪 881 57 11ms 19 Jun 2024 275th wuzekai518 881 57 10ms 2 Aug 2024 275th bizy-coder 881 57 31ms 14 Aug 2024 275th jatloe 881 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