The Calendar hole will go live in approximately 13 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 721st RockOfStone 752 81 2ms 4 Nov 2021 721st dokutan 752 81 2ms 18 Jul 2025 723rd Mabeloid 🇳🇴 750 64 539ms 17 Sep 2024 724th msbranicky 750 67 15ms 21 Aug 2023 725th Yewzir 🇧🇪 750 72 2ms 12 Aug 2023 726th cipharius 750 87 198ms 19 Jan 2021 727th Lydxn 🇨🇦 750 223 13ms 24 Jun 2021 728th ovs-code 🇩🇪 748 49 321ms 2 Jan 2024 729th arctouch-cristiannevianna 747 82 336ms 22 Nov 2023 730th GolfingSuccess 🇬🇷 743 33 48ms 22 Jul 2022 731st kg583 🇺🇸 741 85 48ms 13 Feb 2025 732nd jared-hughes 740 57 36ms 9 Sep 2022 733rd olivermrose 🇺🇸 740 63 9ms 21 Sep 2021 733rd GeorgeStechman 🇬🇧 740 63 9ms 17 Nov 2022 735th janbehrens 🇩🇪 740 73 2ms 11 Jun 2021 736th DialFrost 🇸🇬 740 99 1,055ms 8 Mar 2024 737th SirBogman 🇺🇸 740 139 2ms 21 Dec 2021 738th Stockoh 🇫🇷 739 68 34ms 25 Dec 2021 738th Bonjour27891 🇻🇳 739 68 34ms 1 Sep 2022 738th trist224 🇫🇷 739 68 37ms 18 Oct 2022 738th mousetail 🇳🇱 739 68 35ms 11 Aug 2023 738th Command-Master 739 68 39ms 24 Sep 2023 738th firegene 🇮🇪 739 68 36ms 12 Oct 2024 744th AlephSquirrel 739 99 10ms 18 Jan 2025 744th edsrzf 🇳🇿 739 99 36ms 4 days ago 746th DialFrost 🇸🇬 738 49 268ms 25 Jun 2024 747th MeWhenI 🇻🇦 734 93 4ms 22 May 2023 748th Yewzir 🇧🇪 733 62 739ms 16 Nov 2025 749th guliyevemil1 🇦🇿 733 89 124ms 11 Feb 2021 749th annaproxy 733 89 148ms 17 Aug 2022 749th Shanethegamer 🇺🇸 733 89 116ms 20 Jan 2024 749th snoozingnewt 🇨🇦 733 89 118ms 9 days ago 753rd Omega65536 🇩🇪 733 103 131ms 24 Nov 2022 754th primo-ppcg 🇹🇭 731 117 25ms 14 Jul 2021 755th Shanethegamer 🇺🇸 730 74 2ms 18 May 2022 756th Shanethegamer 🇺🇸 730 88 97ms 15 Oct 2022 757th CaedenHarper 🇨🇦 729 84 380ms 17 Oct 2025 758th dvik72 728 64 9ms 1 Jun 2022 758th AlephSquirrel 728 64 9ms 16 Feb 2023 760th abailey2020 🇺🇸 728 69 10ms 19 Feb 2021 760th Anonymousellama21 728 69 11ms 15 May 2022 760th TaserTheFox 🇺🇸 728 69 36ms 16 Feb 2023 763rd annaproxy 727 58 38ms 24 Oct 2023 764th KatieLG 🇬🇧 727 63 812ms 25 Apr 2021 765th Alex-x90 🇺🇸 727 99 403ms 23 Jun 2022 766th ovs-code 🇩🇪 725 72 12ms 16 Jul 2023 767th yzhs 🇩🇪 725 90 117ms 24 Jul 2021 768th dokutan 724 118 25ms 18 Jul 2025 769th jacobly0 🇺🇸 724 153 1,809ms 22 Apr 2024 769th MeWhenI 🇻🇦 724 153 1,682ms 7 Nov 2025 771st AlephSquirrel 721 34 48ms 30 Dec 2022 772nd primo-ppcg 🇹🇭 720 47 28ms 5 Feb 2022 773rd scpchicken 🇵🇼 719 51 196ms 18 Jan 2023 774th Yewzir 🇧🇪 719 91 2ms 28 Mar 2024 775th edsrzf 🇳🇿 718 95 6ms 24 Nov 2024 776th igmcdowell 717 65 10ms 23 Nov 2021 777th osmith93 717 70 25ms 14 Jun 2021 777th ridingqwerty 🇺🇸 717 70 12ms 23 Feb 2024 777th mbittner20 717 70 13ms 15 Jul 2024 777th luuumine 🇫🇷 717 70 11ms 20 Oct 2025 781st MeWhenI 🇻🇦 717 75 8ms 9 Oct 2023 782nd prplz 🇦🇺 717 91 118ms 25 Jan 2021 783rd msbranicky 716 67 576ms 17 Jan 2024 784th marshallward 🇺🇸 716 100 41ms 7 May 2025 785th NewDefectus 🇮🇱 715 32 34ms 20 Dec 2021 786th NewDefectus 🇮🇱 714 21 2ms 14 Jan 2022 787th prplz 🇦🇺 714 52 3ms 5 Feb 2021 788th MarcMush 🇫🇷 714 69 456ms 12 Feb 2024 789th Herbert00709 🇵🇱 712 101 84ms 19 Nov 2024 790th elgan65536 712 106 147ms 26 Oct 2023 791st targrik 712 123 271ms 10 Jul 2025 792nd NewDefectus 🇮🇱 711 76 2ms 25 Oct 2021 792nd JohandeRuiter 🇳🇱 711 76 2ms 3 Dec 2023 794th emgordon154 711 80 3,639ms 9 Aug 2025 795th MeWhenI 🇻🇦 711 90 1,287ms 14 Jun 2023 796th CaedenHarper 🇨🇦 710 64 766ms 6 Oct 2025 797th marcin7Cd 710 103 21ms 12 Feb 2021 798th Feniske 🇫🇷 709 51 255ms 21 Nov 2023 799th chordowl 709 92 116ms 17 Mar 2021 800th aadenboy 🇺🇸 708 86 3ms 2 days ago First Prev 721–800 of 1,887 Next Last