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 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 477th Yewzir 🇧🇪 842 57 412ms 29 Feb 2024 477th SirBogman 🇺🇸 842 57 471ms 10 Jun 2024 477th lifthrasiir 🇰🇷 842 57 422ms 2 Dec 2024 477th GolfingSuccess 🇬🇷 842 57 436ms 24 Dec 2024 477th emgordon154 842 57 389ms 23 Apr 2025 477th Babafaba 842 57 411ms 19 Nov 2025 477th CaedenHarper 🇨🇦 842 57 406ms 11 days ago 488th MeWhenI 🇻🇦 842 76 37ms 16 Jun 2022 489th ovs-code 🇩🇪 842 87 106ms 8 Mar 2024 490th fuzzylojik-golf 🇺🇸 841 23 3ms 6 Sep 2025 491st btnlq 841 43 246ms 26 Jan 2021 491st primo-ppcg 🇹🇭 841 43 243ms 25 May 2021 493rd primo-ppcg 🇹🇭 841 87 29ms 25 Jan 2023 494th acotis 839 90 126ms 3 Oct 2025 495th Yewzir 🇧🇪 839 132 1,746ms 27 Apr 2024 496th AGoyet 837 60 12ms 29 Jun 2022 496th jakobkordez 🇸🇮 837 60 15ms 8 Nov 2022 496th betaveros 837 60 18ms 31 Dec 2022 496th AlexanderFair 837 60 10ms 23 Jun 2023 496th Andriamanitra 🇫🇮 837 60 13ms 20 Jul 2023 496th dranjohn 837 60 49ms 15 Sep 2023 496th SB-945 837 60 10ms 20 Feb 2024 496th inverseLorentz 🇦🇺 837 60 10ms 9 Apr 2024 496th 051 🇸🇬 837 60 14ms 1 Aug 2024 496th KasperKivimaeki 🇫🇮 837 60 11ms 30 Jun 2025 496th vgamula 🇺🇦 837 60 31ms 28 Jul 2025 496th LuisGoncalves05 🇵🇹 837 60 10ms 29 Jul 2025 508th GrayJoKing 🇦🇺 837 84 462ms 28 Feb 2022 509th GrayJoKing 🇦🇺 834 55 135ms 6 Aug 2024 510th GrayJoKing 🇦🇺 833 57 36ms 5 Sep 2024 511th MeWhenI 🇻🇦 832 56 9ms 8 Jun 2022 511th Yewzir 🇧🇪 832 56 9ms 16 Nov 2023 511th voytxt 🇨🇿 832 56 9ms 25 Jan 2025 511th targrik 832 56 9ms 21 Feb 2025 515th sean-niemann 🇺🇸 832 77 41ms 18 Dec 2023 516th kritixilithos 831 58 3ms 29 May 2024 517th prplz 🇦🇺 831 65 2ms 24 Jan 2021 517th sisyphus-ppcg 🇦🇺 831 65 2ms 25 Jan 2021 517th inventshah 831 65 2ms 17 Nov 2022 517th 09cf 831 65 2ms 24 Sep 2023 517th DialFrost 🇸🇬 831 65 2ms 6 May 2025 522nd primo-ppcg 🇹🇭 831 77 1,312ms 30 Nov 2021 523rd sisyphus-ppcg 🇦🇺 829 60 118ms 25 Feb 2021 523rd sean-niemann 🇺🇸 829 60 113ms 27 Dec 2023 525th neel11235813 828 58 356ms 15 Jan 2024 525th Kacarott 🇦🇺 828 58 342ms 15 Jan 2024 525th Shanethegamer 🇺🇸 828 58 346ms 16 Jan 2024 525th Natanaelel 🇸🇪 828 58 355ms 20 Jan 2024 525th AlephSquirrel 828 58 420ms 21 Jan 2024 525th namelessiw 828 58 402ms 15 Aug 2024 525th snoozingnewt 🇨🇦 828 58 378ms 20 days ago 532nd m-ender 🇩🇪 828 91 153ms 23 Apr 2021 533rd Irratix 🇳🇱 827 51 35ms 4 Mar 2022 534th GrayJoKing 🇦🇺 827 65 4ms 9 Nov 2023 535th Yewzir 🇧🇪 827 85 371ms 16 Nov 2023 536th MeWhenI 🇻🇦 824 78 98ms 14 Oct 2022 537th petroselo 823 61 11ms 16 Nov 2021 537th Irratix 🇳🇱 823 61 11ms 8 Dec 2021 537th cubed-guy 823 61 10ms 12 Feb 2022 537th CedricGebistorf 823 61 10ms 18 Feb 2022 537th jascotm 823 61 10ms 17 May 2022 537th Eilonlif 🇮🇱 823 61 29ms 9 Sep 2022 537th vishwathg 823 61 20ms 18 Sep 2022 537th ZakkkkAttackkkk 🇵🇭 823 61 13ms 19 Aug 2023 537th jtaxen 823 61 10ms 26 Mar 2024 537th ahmetdemirag 🇨🇾 823 61 19ms 5 Nov 2024 537th plcc0 823 61 18ms 9 Mar 2025 537th Pyroan 823 61 14ms 16 Mar 2025 537th tri1212 🇻🇳 823 61 10ms 16 Apr 2025 550th Shanethegamer 🇺🇸 823 83 83ms 19 Apr 2022 551st alemelis 822 60 2,138ms 14 Aug 2024 552nd GrayJoKing 🇦🇺 822 81 120ms 14 Mar 2022 552nd MeWhenI 🇻🇦 822 81 121ms 15 Nov 2022 554th ovs-code 🇩🇪 819 56 130ms 3 Aug 2024 555th primo-ppcg 🇹🇭 819 66 2ms 18 Jan 2021 555th jared-hughes 819 66 2ms 31 Jul 2022 557th NewDefectus 🇮🇱 818 57 9ms 1 Nov 2021 558th KasperKivimaeki 🇫🇮 818 88 62ms 24 days ago 559th inventshah 817 59 2ms 18 May 2022 559th MeWhenI 🇻🇦 817 59 2ms 18 May 2022 First Prev 481–560 of 1,889 Next Last