The Calendar hole will go live in approximately 8 days. Why not try and solve it ahead of time?
Kolakoski Constant 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 81st sean-niemann 🇺🇸 906 149 93ms 7 days ago 82nd kumavale 906 172 133ms 13 Nov 2025 83rd JayXon 🇺🇸 905 72 335ms 16 Jul 2021 84th rucin93 🇵🇱 904 80 155ms 27 Aug 2024 85th SirBogman 🇺🇸 902 41 40ms 8 Aug 2023 86th janlelis 902 63 749ms 24 Aug 2022 87th sean-niemann 🇺🇸 902 108 273ms 25 Jun 2025 88th Steffan153 🇫🇮 902 126 115ms 21 Jun 2024 89th primo-ppcg 🇹🇭 902 137 311ms 27 Mar 2021 90th zacjl 901 107 42ms 16 May 2025 91st SirBogman 🇺🇸 901 147 47ms 2 Jun 2025 92nd sean-niemann 🇺🇸 901 167 603ms 31 Dec 2024 93rd canissimia 🇦🇶 901 202 4,934ms 14 days ago 94th ovs-code 🇩🇪 900 150 76ms 18 Mar 2024 95th HPWiz 🇳🇿 898 121 18ms 23 Sep 2025 96th ovs-code 🇩🇪 897 128 1,416ms 30 Oct 2024 97th sean-niemann 🇺🇸 897 154 272ms 18 Jun 2025 98th nwellnhof 🇩🇪 896 77 10ms 29 May 2023 99th Steffan153 🇫🇮 896 78 366ms 15 Jul 2024 100th primo-ppcg 🇹🇭 896 156 68ms 20 Jun 2022 101st primo-ppcg 🇹🇭 895 191 3,031ms 5 Feb 2022 102nd GrayJoKing 🇦🇺 894 101 73ms 27 Oct 2023 103rd JayXon 🇺🇸 894 150 277ms 29 May 2023 104th sean-niemann 🇺🇸 893 81 158ms 3 Aug 2024 105th xsot 🇸🇬 893 109 483ms 27 days ago 106th primo-ppcg 🇹🇭 891 158 349ms 18 Sep 2023 107th primo-ppcg 🇹🇭 891 198 32ms 10 May 2023 108th jared-hughes 889 333 3,058ms 22 Dec 2023 109th pardouin 🇫🇷 886 95 1,100ms 14 Apr 2025 110th kg583 🇺🇸 886 129 16ms 16 Oct 2024 111th sean-niemann 🇺🇸 886 130 450ms 22 Jul 2024 111th namelessiw 886 130 403ms 22 Jul 2025 113th kg583 🇺🇸 885 79 461ms 15 Jan 2024 113th Lydxn 🇨🇦 885 79 377ms 16 Jan 2024 113th sean-niemann 🇺🇸 885 79 381ms 12 Mar 2025 116th primo-ppcg 🇹🇭 884 83 445ms 26 May 2021 117th GrayJoKing 🇦🇺 884 340 517ms 9 Mar 2023 118th UnderKoen 🇳🇱 884 583 2ms 11 Nov 2024 119th xnor-gate 883 77 14ms 7 Apr 2021 119th HPWiz 🇳🇿 883 77 12ms 2 Apr 2023 119th 4atj 883 77 15ms 20 Jul 2025 122nd lynn 882 99 1,286ms 9 Apr 2021 123rd sean-niemann 🇺🇸 882 103 464ms 25 Jun 2025 124th sean-niemann 🇺🇸 882 146 949ms 19 Nov 2025 125th inventshah 882 153 108ms 30 Jan 2023 126th clockworknazo 880 45 91ms 21 Sep 2022 127th primo-ppcg 🇹🇭 878 313 680ms 13 Aug 2025 128th error256 877 103 73ms 13 Sep 2024 129th Steffan153 🇫🇮 877 111 835ms 30 Aug 2024 130th primo-ppcg 🇹🇭 877 151 52ms 3 May 2025 131st DialFrost 🇸🇬 874 80 430ms 24 Jan 2024 132nd JayXon 🇺🇸 874 201 1,638ms 15 Sep 2025 133rd primo-ppcg 🇹🇭 873 79 11ms 18 Mar 2021 133rd rucin93 🇵🇱 873 79 25ms 22 Jul 2024 133rd sean-niemann 🇺🇸 873 79 25ms 3 Aug 2024 136th nwellnhof 🇩🇪 871 155 81ms 29 May 2023 137th acotis 871 179 188ms 26 Jun 2025 138th MarcMush 🇫🇷 871 581 4ms 5 Feb 2024 139th MeWhenI 🇻🇦 869 574 5ms 16 Dec 2024 140th primo-ppcg 🇹🇭 868 140 193ms 2 Apr 2021 141st MeWhenI 🇻🇦 868 583 7ms 25 Jul 2023 142nd ovs-code 🇩🇪 867 229 666ms 24 Jan 2025 143rd MeWhenI 🇻🇦 867 266 89ms 7 Dec 2022 144th m-tkach 🇺🇦 867 595 3ms 6 Mar 2024 145th snoozingnewt 🇨🇦 866 167 106ms 16 days ago 146th SirBogman 🇺🇸 864 85 266ms 5 Jan 2024 147th AlephSquirrel 863 81 400ms 16 Jan 2024 148th sisyphus-ppcg 🇦🇺 861 66 1,023ms 23 Mar 2023 149th primo-ppcg 🇹🇭 861 79 83ms 18 Mar 2021 149th Lydxn 🇨🇦 861 79 12ms 8 Apr 2023 149th nwellnhof 🇩🇪 861 79 11ms 26 May 2023 149th kg583 🇺🇸 861 79 11ms 27 May 2023 149th stefangimmillaro 861 79 12ms 18 Sep 2023 149th Steffan153 🇫🇮 861 79 14ms 15 Jul 2024 149th zacjl 861 79 11ms 7 Nov 2024 149th sean-niemann 🇺🇸 861 79 14ms 12 Mar 2025 149th Seek64 🇩🇪 861 79 13ms 15 May 2025 158th ovs-code 🇩🇪 861 84 132ms 4 Aug 2024 159th Kacarott 🇦🇺 860 105 70ms 13 Sep 2024 160th stefangimmillaro 859 98 876ms 1 Aug 2023 First Prev 81–160 of 1,710 Next Last