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 641st ashtraypettingzoo 🇺🇸 789 19 2ms 3 Apr 2023 641st AlephSquirrel 789 19 2ms 8 Nov 2025 643rd MeWhenI 🇻🇦 789 63 107ms 16 Nov 2022 644th MeWhenI 🇻🇦 789 83 3ms 10 Sep 2022 645th kkoenig 789 111 274ms 5 Jan 2024 646th prplz 🇦🇺 786 46 260ms 24 Jan 2021 646th TimCurwick 🇺🇸 786 46 251ms 26 Jan 2021 646th SirBogman 🇺🇸 786 46 230ms 2 Feb 2024 649th SirBogman 🇺🇸 786 91 38ms 3 Jun 2025 650th RDShah 785 64 10ms 17 Jan 2021 650th andre-lameirinhas 🇵🇹 785 64 10ms 22 Feb 2021 650th stertooy 🇧🇪 785 64 10ms 10 Jun 2024 650th Terobero 785 64 20ms 6 Sep 2024 650th moustave 785 64 11ms 5 May 2025 650th Code-Coder-coder 785 64 11ms 26 days ago 650th Lv0Sys 🇵🇱 785 64 10ms 17 days ago 657th Yewzir 🇧🇪 784 82 99ms 28 Mar 2024 658th Shanethegamer 🇺🇸 782 63 430ms 2 Jul 2021 659th Waffle3z 781 54 37ms 19 Jan 2021 659th KatieLG 🇬🇧 781 54 38ms 9 Jan 2023 659th Andriamanitra 🇫🇮 781 54 47ms 20 Jul 2023 662nd DialFrost 🇸🇬 780 142 1,630ms 13 Sep 2025 663rd Shanethegamer 🇺🇸 778 106 33ms 20 Jan 2025 664th rak1507 🇬🇧 777 60 9ms 20 Jan 2021 664th Shanethegamer 🇺🇸 777 60 9ms 26 Sep 2021 664th duckyluuk 🇳🇱 777 60 9ms 4 Oct 2024 667th anter69 🇭🇺 776 59 982ms 24 Feb 2023 667th SirBogman 🇺🇸 776 59 1,152ms 10 Jun 2024 669th NewDefectus 🇮🇱 774 25 4ms 25 Oct 2021 670th scpchicken 🇵🇼 774 48 3ms 15 Dec 2022 671st commandblockguy 🇺🇸 774 62 425ms 15 Jan 2024 672nd Shanethegamer 🇺🇸 774 93 68ms 12 Jan 2022 673rd ovs-code 🇩🇪 774 142 12ms 31 Mar 2023 674th TobyBoyne 🇬🇧 773 65 10ms 21 Jan 2021 674th 77Tigers 773 65 30ms 1 Mar 2021 674th knutae 🇳🇴 773 65 10ms 29 Jun 2021 674th ehulinsky 🇺🇸 773 65 13ms 10 Nov 2021 674th guilhem-roy 🇫🇷 773 65 10ms 28 Feb 2022 674th martinnorling 🇸🇪 773 65 10ms 8 Mar 2022 674th fgrosshans 🇫🇷 773 65 11ms 12 Jul 2022 674th IshanPanpaliya 773 65 10ms 3 May 2023 674th nooberitess 773 65 11ms 8 Apr 2025 674th robin-scragg 773 65 10ms 21 Oct 2025 684th MeWhenI 🇻🇦 772 59 701ms 15 Sep 2025 685th c0d3-4-F00d 🇩🇪 772 70 2ms 18 Mar 2022 685th Alex-x90 🇺🇸 772 70 2ms 6 Mar 2023 685th dokutan 772 70 5ms 18 Jul 2025 688th mousetail 🇳🇱 771 98 116ms 3 Oct 2024 689th MeWhenI 🇻🇦 770 47 259ms 28 Jan 2023 690th LostSyntax21 🇬🇧 767 55 62ms 2 Oct 2024 691st MeWhenI 🇻🇦 767 89 104ms 25 Dec 2022 692nd emgordon154 766 32 53ms 19 Oct 2025 693rd Steffan153 🇫🇮 765 51 80ms 18 Dec 2022 694th retrohun 765 63 102ms 23 Jan 2023 695th Shanethegamer 🇺🇸 765 65 108ms 22 May 2021 696th lynn 765 78 150ms 16 Nov 2021 697th rucin93 🇵🇱 764 60 127ms 9 Aug 2024 698th Waffle3z 764 61 9ms 20 Jan 2021 698th didion0 🇺🇸 764 61 9ms 9 Feb 2021 698th KrausRaus 🇺🇸 764 61 10ms 19 Feb 2021 698th tayloia 🇬🇧 764 61 8ms 29 May 2022 702nd MeWhenI 🇻🇦 764 108 27ms 7 Jun 2023 703rd ScottHamper 762 90 446ms 21 days ago 704th ArmaanAS 761 66 11ms 4 Apr 2021 704th quimey 761 66 11ms 23 Jun 2023 704th solisolu 761 66 19ms 27 Oct 2025 707th albanian-laundromat 759 60 718ms 1 Oct 2025 708th SirBogman 🇺🇸 759 86 115ms 24 Jan 2021 708th strout 759 86 124ms 15 Dec 2023 710th antimon2 🇯🇵 758 65 635ms 19 Jan 2021 711th GolfingSuccess 🇬🇷 758 71 6ms 16 Oct 2023 711th Yewzir 🇧🇪 758 71 3ms 19 Nov 2025 713th kcinnu 🇱🇹 758 146 1,731ms 17 May 2024 714th duckyluuk 🇳🇱 756 73 7ms 16 Dec 2024 715th janbehrens 🇩🇪 756 93 464ms 24 Mar 2022 716th Shanethegamer 🇺🇸 754 63 4ms 13 Aug 2024 716th emgordon154 754 63 4ms 25 Aug 2024 718th olivermrose 🇺🇸 753 56 37ms 21 Sep 2021 719th lynn 753 85 1,315ms 12 Sep 2021 720th sean-niemann 🇺🇸 752 61 141ms 17 Jun 2025 First Prev 641–720 of 1,891 Next Last