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 275th 5quiwyrm 881 57 10ms 14 Nov 2024 275th lifthrasiir 🇰🇷 881 57 10ms 15 Nov 2024 275th GolfingSuccess 🇬🇷 881 57 12ms 24 Dec 2024 275th emgordon154 881 57 10ms 23 Apr 2025 275th qpwoeirut 881 57 13ms 11 Aug 2025 275th michaelmgreer 881 57 10ms 9 Oct 2025 275th Babafaba 881 57 12ms 19 Nov 2025 275th CaedenHarper 🇨🇦 881 57 11ms 12 days ago 329th emplv 🇱🇻 881 97 26ms 27 Jul 2023 330th SirBogman 🇺🇸 880 22 4ms 30 Sep 2022 331st JayXon 🇺🇸 880 73 98ms 15 Oct 2022 331st Steffan153 🇫🇮 880 73 97ms 7 Dec 2022 331st sean-niemann 🇺🇸 880 73 98ms 20 May 2024 334th tomtheisen 🇺🇸 879 53 9ms 18 Jan 2021 334th prplz 🇦🇺 879 53 9ms 24 Jan 2021 334th jakzo 879 53 9ms 5 Sep 2021 334th ovs-code 🇩🇪 879 53 9ms 5 Oct 2023 334th dokutan 879 53 9ms 18 Jul 2025 339th Steffan153 🇫🇮 879 54 8ms 18 Aug 2024 340th namelessiw 879 78 551ms 2 Oct 2025 340th Yewzir 🇧🇪 879 78 677ms 2 Oct 2025 342nd Steffan153 🇫🇮 878 94 48ms 18 Jan 2023 343rd GrayJoKing 🇦🇺 877 73 41ms 27 Jun 2022 343rd primo-ppcg 🇹🇭 877 73 40ms 28 Jun 2022 345th m-tkach 🇺🇦 877 107 16ms 17 May 2022 346th primo-ppcg 🇹🇭 876 28 45ms 30 Sep 2022 347th saito-ta 🇯🇵 876 55 3ms 26 May 2022 347th nwellnhof 🇩🇪 876 55 3ms 13 May 2023 349th GrayJoKing 🇦🇺 876 63 7ms 31 Jan 2025 350th emplv 🇱🇻 876 100 273ms 18 Jan 2022 350th stefangimmillaro 876 100 318ms 21 Jun 2023 352nd namelessiw 875 70 362ms 18 Jul 2025 353rd zacjl 875 72 41ms 13 Feb 2025 354th primo-ppcg 🇹🇭 875 78 4ms 2 May 2023 355th Steffan153 🇫🇮 874 89 106ms 18 Aug 2024 356th Lydxn 🇨🇦 873 55 392ms 16 Jan 2024 356th m-tkach 🇺🇦 873 55 374ms 20 Jan 2024 356th JayXon 🇺🇸 873 55 346ms 21 Jan 2024 356th sean-niemann 🇺🇸 873 55 385ms 26 Jan 2025 360th stefangimmillaro 873 82 39ms 26 Apr 2025 361st JayXon 🇺🇸 872 57 108ms 1 May 2023 361st primo-ppcg 🇹🇭 872 57 119ms 1 May 2023 363rd jared-hughes 872 126 15ms 7 Jul 2024 364th JayXon 🇺🇸 872 127 1,725ms 22 Apr 2024 365th Irratix 🇳🇱 871 62 2ms 20 Dec 2021 365th ovs-code 🇩🇪 871 62 2ms 8 May 2023 365th sean-niemann 🇺🇸 871 62 2ms 18 Dec 2023 368th ovs-code 🇩🇪 868 81 468ms 15 Jun 2024 368th DialFrost 🇸🇬 868 81 365ms 7 Nov 2025 370th btjones0 868 87 119ms 26 Jan 2021 370th lynn 868 87 117ms 7 Jul 2024 372nd Irratix 🇳🇱 867 83 70ms 3 Jan 2022 372nd ovs-code 🇩🇪 867 83 73ms 3 Jun 2024 372nd DialFrost 🇸🇬 867 83 68ms 7 Nov 2025 375th Espiobest 866 58 10ms 13 Mar 2021 375th MaxElf999 866 58 10ms 3 Oct 2022 375th Shanethegamer 🇺🇸 866 58 29ms 18 Jan 2023 375th Alex-x90 🇺🇸 866 58 28ms 23 Mar 2023 375th neel11235813 866 58 28ms 24 Mar 2023 375th Natanaelel 🇸🇪 866 58 11ms 11 Apr 2023 375th InigoK 🇺🇸 866 58 28ms 28 May 2023 375th jmerle 🇳🇱 866 58 29ms 3 Jul 2023 375th ndren 866 58 30ms 4 Aug 2023 375th FlorianCassayre 🇫🇷 866 58 19ms 13 Sep 2023 375th Kacarott 🇦🇺 866 58 28ms 13 Oct 2023 375th m42km 866 58 29ms 25 Nov 2023 375th StefanHabel 🇨🇦 866 58 12ms 20 Apr 2024 375th NickTheEASDude 🇺🇸 866 58 29ms 1 Jul 2024 375th namelessiw 866 58 29ms 27 Jul 2024 375th edsrzf 🇳🇿 866 58 19ms 22 Nov 2024 375th ryyyn 🇺🇸 866 58 27ms 6 Jan 2025 375th croc54 866 58 28ms 9 Jan 2025 375th andrewjc2000 866 58 30ms 11 Mar 2025 375th Mukundan314 866 58 28ms 27 Apr 2025 375th fkantelberg 866 58 20ms 12 Jul 2025 375th wuduculfre 866 58 29ms 22 Jul 2025 375th cros107 🇦🇺 866 58 10ms 16 Sep 2025 375th HETHAT 🇩🇿 866 58 29ms 24 Sep 2025 375th blaztoma 🇱🇹 866 58 29ms 30 Sep 2025 375th CornerMercury 🇬🇧 866 58 30ms 24 Nov 2025 First Prev 321–400 of 1,891 Next Last