The Calendar hole will go live in approximately 7 days. Why not try and solve it ahead of time?
Kolakoski Constant in all languages in chars. 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 Chars Time Submitted 81st primo-ppcg 🇹🇭 895 137 311ms 27 Mar 2021 82nd SirBogman 🇺🇸 895 147 47ms 2 Jun 2025 83rd sean-niemann 🇺🇸 894 108 232ms 25 Jun 2025 84th ovs-code 🇩🇪 894 150 73ms 18 Mar 2024 85th HPWiz 🇳🇿 892 121 18ms 4 Mar 2021 86th zacjl 891 107 42ms 16 May 2025 87th sean-niemann 🇺🇸 891 151 82ms 6 Jul 2025 88th sean-niemann 🇺🇸 891 154 272ms 18 Jun 2025 89th UnderKoen 🇳🇱 891 257 2ms 22 Feb 2024 89th m-tkach 🇺🇦 891 257 2ms 6 Mar 2024 91st primo-ppcg 🇹🇭 890 191 3,031ms 5 Feb 2022 92nd JayXon 🇺🇸 889 55 797ms 23 Mar 2023 92nd Lydxn 🇨🇦 889 55 792ms 13 May 2023 92nd Steffan153 🇫🇮 889 55 787ms 20 Aug 2024 92nd radarek 🇵🇱 889 55 783ms 12 Dec 2024 92nd sean-niemann 🇺🇸 889 55 772ms 28 Dec 2024 92nd pardouin 🇫🇷 889 55 877ms 3 Sep 2025 98th ovs-code 🇩🇪 889 128 1,416ms 30 Oct 2024 99th JayXon 🇺🇸 889 148 283ms 29 May 2023 100th nwellnhof 🇩🇪 888 77 10ms 29 May 2023 101st xsot 🇸🇬 886 109 367ms 25 Nov 2025 102nd primo-ppcg 🇹🇭 886 198 32ms 10 May 2023 103rd jared-hughes 886 333 3,058ms 22 Dec 2023 104th primo-ppcg 🇹🇭 884 158 349ms 18 Sep 2023 105th Steffan153 🇫🇮 881 66 70ms 21 Apr 2023 105th hallvabo 🇳🇴 881 66 11ms 5 Jan 2024 105th CornerMercury 🇬🇧 881 66 62ms 19 Nov 2025 108th MeWhenI 🇻🇦 881 216 4ms 29 Jul 2023 109th GrayJoKing 🇦🇺 881 340 517ms 9 Mar 2023 110th Bubbler-4 879 39 38ms 4 Mar 2023 111th sean-niemann 🇺🇸 879 129 450ms 22 Jul 2024 111th kg583 🇺🇸 879 129 16ms 16 Oct 2024 111th namelessiw 879 129 403ms 22 Jul 2025 114th MeWhenI 🇻🇦 878 224 6ms 12 Jan 2025 115th pardouin 🇫🇷 877 95 1,100ms 14 Apr 2025 116th inventshah 877 153 84ms 30 Jan 2023 117th primo-ppcg 🇹🇭 875 313 680ms 13 Aug 2025 118th nwellnhof 🇩🇪 874 78 252ms 27 Oct 2024 119th lynn 874 99 1,286ms 9 Apr 2021 120th sean-niemann 🇺🇸 874 146 949ms 19 Nov 2025 121st sean-niemann 🇺🇸 873 103 464ms 25 Jun 2025 122nd sean-niemann 🇺🇸 872 67 158ms 15 Dec 2024 123rd primo-ppcg 🇹🇭 871 151 52ms 3 May 2025 124th Steffan153 🇫🇮 870 111 835ms 30 Aug 2024 125th JayXon 🇺🇸 869 68 259ms 16 Jul 2021 126th TFeld00 🇩🇰 868 67 11ms 18 Jan 2021 126th ndren 868 67 114ms 2 Sep 2023 128th GrayJoKing 🇦🇺 868 96 72ms 9 Dec 2023 129th JayXon 🇺🇸 868 201 1,638ms 15 Sep 2025 130th primo-ppcg 🇹🇭 866 79 11ms 18 Mar 2021 130th rucin93 🇵🇱 866 79 25ms 22 Jul 2024 130th sean-niemann 🇺🇸 866 79 25ms 3 Aug 2024 133rd acotis 866 179 188ms 26 Jun 2025 134th nwellnhof 🇩🇪 865 155 67ms 29 May 2023 135th snoozingnewt 🇨🇦 864 164 106ms 17 days ago 135th blaztoma 🇱🇹 864 164 102ms 93 mins ago 137th btnlq 863 79 563ms 26 Jan 2021 138th primo-ppcg 🇹🇭 863 156 68ms 20 Jun 2022 139th MeWhenI 🇻🇦 863 266 89ms 29 Dec 2021 140th primo-ppcg 🇹🇭 862 140 193ms 2 Apr 2021 141st ovs-code 🇩🇪 862 229 666ms 24 Jan 2025 142nd lifthrasiir 🇰🇷 860 68 371ms 2 Dec 2024 143rd GrayJoKing 🇦🇺 860 97 122ms 6 Jun 2022 144th janlelis 858 57 766ms 21 Sep 2024 145th jakobkordez 🇸🇮 856 68 66ms 8 Nov 2022 146th AlephSquirrel 853 133 16ms 18 Jan 2025 147th emgordon154 851 205 1,785ms 5 days ago 148th emgordon154 851 232 643ms 21 May 2025 149th stefangimmillaro 850 98 876ms 1 Aug 2023 150th inventshah 850 113 4,387ms 6 Nov 2024 150th JayXon 🇺🇸 850 113 3,485ms 8 Dec 2024 152nd jared-hughes 848 102 144ms 11 Sep 2023 153rd Steffan153 🇫🇮 848 119 102ms 10 Apr 2023 154th Babafaba 847 69 435ms 5 Nov 2025 155th stefangimmillaro 844 81 11ms 26 Sep 2023 155th ovs-code 🇩🇪 844 81 11ms 4 Aug 2024 157th jared-hughes 844 159 65ms 15 Feb 2023 158th btjones0 843 69 18ms 15 Jul 2022 158th SirBogman 🇺🇸 843 69 11ms 5 Jan 2024 158th lifthrasiir 🇰🇷 843 69 11ms 16 Nov 2024 First Prev 81–160 of 1,691 Next Last