The Calendar hole will go live in approximately 13 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 161st Kacarott 🇦🇺 860 105 70ms 13 Sep 2024 162nd stefangimmillaro 859 98 876ms 1 Aug 2023 163rd AlephSquirrel 859 133 16ms 18 Jan 2025 164th inventshah 857 113 4,387ms 6 Nov 2024 164th JayXon 🇺🇸 857 113 3,678ms 8 Dec 2024 166th emgordon154 857 205 2,450ms 3 hours ago 167th jared-hughes 856 102 144ms 11 Sep 2023 168th GrayJoKing 🇦🇺 856 107 18ms 12 Feb 2023 169th Steffan153 🇫🇮 856 119 102ms 10 Apr 2023 170th emgordon154 856 232 643ms 21 May 2025 171st Shanethegamer 🇺🇸 855 133 97ms 16 Dec 2022 172nd GrayJoKing 🇦🇺 854 68 1,404ms 27 Oct 2023 173rd sean-niemann 🇺🇸 852 75 772ms 20 Sep 2025 174th stefangimmillaro 852 81 11ms 26 Sep 2023 174th ovs-code 🇩🇪 852 81 11ms 4 Aug 2024 176th btnlq 850 80 30ms 19 Jan 2021 176th Irratix 🇳🇱 850 80 13ms 26 Apr 2022 176th DialFrost 🇸🇬 850 80 56ms 3 Oct 2023 176th MeWhenI 🇻🇦 850 80 14ms 7 Jun 2024 176th bizy-coder 850 80 12ms 18 Oct 2024 181st typeswitch-dev 🇵🇹 850 595 6ms 4 Aug 2023 182nd Steffan153 🇫🇮 849 107 459ms 30 Aug 2024 183rd jared-hughes 849 159 68ms 15 Feb 2023 184th sean-niemann 🇺🇸 847 184 132ms 8 Jun 2025 185th ovs-code 🇩🇪 846 112 498ms 27 Jul 2024 186th sean-niemann 🇺🇸 845 155 457ms 26 Sep 2025 187th ovs-code 🇩🇪 844 107 413ms 13 Sep 2023 188th GrayJoKing 🇦🇺 842 135 119ms 9 Jun 2022 189th xsot 🇸🇬 841 108 756ms 15 Jun 2025 190th AlephSquirrel 839 81 59ms 10 Feb 2023 190th CornerMercury 🇬🇧 839 81 61ms 19 Nov 2025 192nd Irratix 🇳🇱 839 161 91ms 17 Dec 2022 193rd primo-ppcg 🇹🇭 834 137 89ms 26 Jan 2023 194th ovs-code 🇩🇪 832 105 146ms 11 May 2023 195th emgordon154 832 174 109ms 13 days ago 196th NewDefectus 🇮🇱 831 83 10ms 1 Nov 2021 196th MeWhenI 🇻🇦 831 83 12ms 7 Jun 2024 198th kg583 🇺🇸 831 116 47ms 13 Feb 2025 199th SirBogman 🇺🇸 830 70 2,833ms 5 Jan 2024 200th DialFrost 🇸🇬 830 77 764ms 16 Sep 2025 201st hallvabo 🇳🇴 829 82 11ms 5 Jan 2024 202nd CLOStrophobic 🇮🇹 828 138 463ms 25 Feb 2025 203rd SirBogman 🇺🇸 825 48 77ms 28 Sep 2022 204th Steffan153 🇫🇮 823 132 11ms 30 Aug 2024 205th TFeld00 🇩🇰 819 83 10ms 18 Jan 2021 206th nwellnhof 🇩🇪 819 160 871ms 25 Sep 2025 207th emplv 🇱🇻 814 125 108ms 14 Dec 2022 208th lifthrasiir 🇰🇷 813 86 379ms 2 Dec 2024 209th MeWhenI 🇻🇦 813 89 132ms 3 Aug 2024 209th pardouin 🇫🇷 813 89 167ms 27 Sep 2024 211th tomtheisen 🇺🇸 812 85 10ms 19 Jan 2021 212th nwellnhof 🇩🇪 811 134 12ms 29 May 2023 213th saito-ta 🇯🇵 811 135 2,593ms 13 Nov 2023 214th bricknellj 809 84 17ms 24 Feb 2023 214th ndren 809 84 124ms 2 Sep 2023 214th ryyyn 🇺🇸 809 84 62ms 17 days ago 217th primo-ppcg 🇹🇭 809 104 1,150ms 26 Mar 2021 218th sean-niemann 🇺🇸 808 173 47ms 26 Dec 2024 219th Natanaelel 🇸🇪 807 72 275ms 1 May 2025 220th MeWhenI 🇻🇦 807 91 1,345ms 28 Jan 2023 221st KasperKivimaeki 🇫🇮 805 135 34ms 3 Sep 2025 222nd SirBogman 🇺🇸 803 87 413ms 20 Jan 2024 223rd emgordon154 803 642 4ms 11 Jul 2024 224th tayloia 🇬🇧 802 86 10ms 17 Jan 2023 224th pardouin 🇫🇷 802 86 28ms 27 Sep 2024 226th KatieLG 🇬🇧 801 644 3ms 11 Oct 2025 227th MeWhenI 🇻🇦 800 71 62ms 7 Jun 2024 228th stefangimmillaro 799 164 646ms 6 Oct 2025 229th emgordon154 794 88 511ms 2 Apr 2025 229th Babafaba 794 88 485ms 5 Nov 2025 231st AdrienHache 🇫🇷 794 145 359ms 7 Dec 2023 232nd MeWhenI 🇻🇦 792 50 81ms 7 Jun 2024 233rd jakobkordez 🇸🇮 791 86 67ms 8 Nov 2022 234th dokutan 791 652 3ms 7 Nov 2025 235th stefangimmillaro 789 129 107ms 3 Oct 2023 236th Irratix 🇳🇱 787 138 13ms 17 Dec 2022 237th antimon2 🇯🇵 785 83 931ms 15 Oct 2022 238th itsh01 784 88 11ms 14 Sep 2022 239th sean-niemann 🇺🇸 783 121 545ms 22 Jul 2024 240th inventshah 782 139 2ms 17 Dec 2022 First Prev 161–240 of 1,706 Next Last