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 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 161st primo-ppcg 🇹🇭 841 99 203ms 5 Apr 2025 162nd Steffan153 🇫🇮 840 107 459ms 30 Aug 2024 163rd sean-niemann 🇺🇸 840 154 467ms 26 Sep 2025 164th emgordon154 839 208 1,672ms 18 Sep 2025 165th sean-niemann 🇺🇸 838 75 772ms 20 Sep 2025 166th SirBogman 🇺🇸 837 41 40ms 8 Aug 2023 167th ovs-code 🇩🇪 837 112 498ms 27 Jul 2024 168th pardouin 🇫🇷 835 70 167ms 28 Sep 2024 169th Irratix 🇳🇱 833 161 91ms 17 Dec 2022 170th xsot 🇸🇬 832 108 756ms 15 Jun 2025 171st orthoplex 🇨🇽 831 70 40ms 29 Jul 2021 172nd nwellnhof 🇩🇪 829 59 835ms 26 May 2023 172nd ovs-code 🇩🇪 829 59 1,009ms 22 Oct 2023 172nd stefangimmillaro 829 59 975ms 30 Dec 2024 175th primo-ppcg 🇹🇭 828 137 89ms 26 Jan 2023 176th Steffan153 🇫🇮 827 145 148ms 30 Aug 2024 177th Steffan153 🇫🇮 826 95 17ms 11 Feb 2023 178th NewDefectus 🇮🇱 824 83 10ms 1 Nov 2021 178th MeWhenI 🇻🇦 824 83 12ms 7 Jun 2024 180th ovs-code 🇩🇪 824 105 146ms 11 May 2023 181st kg583 🇺🇸 822 116 47ms 13 Feb 2025 182nd CLOStrophobic 🇮🇹 822 138 463ms 25 Feb 2025 183rd primo-ppcg 🇹🇭 821 83 445ms 26 May 2021 184th emgordon154 820 172 109ms 13 days ago 185th annaproxy 819 71 11ms 8 Jun 2022 186th Steffan153 🇫🇮 817 132 11ms 30 Aug 2024 187th DialFrost 🇸🇬 816 77 764ms 16 Sep 2025 188th Shanethegamer 🇺🇸 812 72 352ms 16 Jan 2024 188th neel11235813 812 72 376ms 29 Mar 2024 188th duckyluuk 🇳🇱 812 72 343ms 29 Aug 2024 191st dokutan 812 282 2ms 7 Nov 2025 192nd MeWhenI 🇻🇦 811 37 209ms 25 Aug 2022 193rd jared-hughes 811 148 239ms 15 Feb 2023 194th AdrienHache 🇫🇷 810 140 359ms 7 Dec 2023 195th Shanethegamer 🇺🇸 808 72 24ms 28 May 2022 195th anter69 🇭🇺 808 72 12ms 22 Jan 2023 195th duckyluuk 🇳🇱 808 72 12ms 15 Aug 2024 195th 5cw 🇺🇸 808 72 24ms 3 May 2025 199th nwellnhof 🇩🇪 808 160 871ms 25 Sep 2025 200th emplv 🇱🇻 807 125 108ms 14 Dec 2022 201st nwellnhof 🇩🇪 805 134 12ms 29 May 2023 202nd saito-ta 🇯🇵 805 135 2,593ms 13 Nov 2023 203rd tomtheisen 🇺🇸 804 85 10ms 19 Jan 2021 204th emgordon154 801 73 489ms 4 Mar 2025 205th DialFrost 🇸🇬 801 98 729ms 31 Oct 2023 206th primo-ppcg 🇹🇭 801 104 1,150ms 26 Mar 2021 207th KasperKivimaeki 🇫🇮 799 135 34ms 3 Sep 2025 208th neel11235813 797 73 65ms 6 Feb 2023 208th emgordon154 797 73 132ms 4 Mar 2025 208th fkantelberg 797 73 512ms 14 Jul 2025 211th nwellnhof 🇩🇪 796 62 1,335ms 5 Dec 2022 212th tayloia 🇬🇧 795 86 10ms 17 Jan 2023 212th pardouin 🇫🇷 795 86 28ms 27 Sep 2024 214th Kacarott 🇦🇺 793 105 70ms 13 Sep 2024 215th emgordon154 789 38 67ms 18 Nov 2025 216th FlyingPenguin223 789 152 700ms 20 Apr 2025 216th sean-niemann 🇺🇸 789 152 140ms 17 Jul 2025 218th stefangimmillaro 789 164 646ms 6 Oct 2025 219th jacklynnepenick 786 74 11ms 19 Aug 2021 220th clockworknazo 785 100 14ms 29 Jun 2023 221st snoozingnewt 🇨🇦 784 111 934ms 25 days ago 222nd stefangimmillaro 782 129 107ms 3 Oct 2023 223rd Irratix 🇳🇱 782 138 13ms 17 Dec 2022 224th ovs-code 🇩🇪 779 75 480ms 15 Mar 2025 225th ovs-code 🇩🇪 778 107 413ms 13 Sep 2023 226th dmrichwa 🇺🇸 777 88 15ms 9 Jun 2022 226th itsh01 777 88 11ms 14 Sep 2022 228th ovs-code 🇩🇪 776 75 52ms 15 Mar 2025 229th inventshah 776 139 2ms 17 Dec 2022 230th sean-niemann 🇺🇸 775 121 545ms 22 Jul 2024 231st Waffle3z 774 155 522ms 8 Apr 2022 232nd GrayJoKing 🇦🇺 773 112 122ms 21 Jan 2021 233rd emgordon154 769 76 122ms 4 Mar 2025 234th prplz 🇦🇺 768 89 9ms 8 Feb 2021 235th tomtheisen 🇺🇸 766 148 363ms 21 Nov 2021 236th jared-hughes 765 141 15ms 15 Feb 2023 237th MeWhenI 🇻🇦 764 64 212ms 25 Jul 2023 238th SirBogman 🇺🇸 762 54 11ms 22 Feb 2024 239th Herbert00709 🇵🇱 762 176 146ms 20 Nov 2024 240th inventshah 762 180 281ms 19 Sep 2022 First Prev 161–240 of 1,685 Next Last