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 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 sean-niemann 🇺🇸 843 184 132ms 8 Jun 2025 162nd MeWhenI 🇻🇦 842 202 13ms 10 Nov 2021 163rd primo-ppcg 🇹🇭 841 99 203ms 5 Apr 2025 164th Steffan153 🇫🇮 840 107 459ms 30 Aug 2024 165th sean-niemann 🇺🇸 840 154 467ms 26 Sep 2025 166th sean-niemann 🇺🇸 838 75 772ms 20 Sep 2025 167th SirBogman 🇺🇸 837 41 40ms 8 Aug 2023 168th ovs-code 🇩🇪 837 112 498ms 27 Jul 2024 169th pardouin 🇫🇷 835 70 167ms 28 Sep 2024 170th Irratix 🇳🇱 833 161 91ms 17 Dec 2022 171st xsot 🇸🇬 832 108 756ms 15 Jun 2025 172nd orthoplex 🇨🇽 831 70 40ms 29 Jul 2021 173rd nwellnhof 🇩🇪 829 59 835ms 26 May 2023 173rd ovs-code 🇩🇪 829 59 1,009ms 22 Oct 2023 173rd stefangimmillaro 829 59 975ms 30 Dec 2024 176th primo-ppcg 🇹🇭 828 137 89ms 26 Jan 2023 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 18 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 AdrienHache 🇫🇷 810 140 359ms 7 Dec 2023 194th Shanethegamer 🇺🇸 808 72 24ms 28 May 2022 194th anter69 🇭🇺 808 72 12ms 22 Jan 2023 194th duckyluuk 🇳🇱 808 72 12ms 15 Aug 2024 194th 5cw 🇺🇸 808 72 24ms 3 May 2025 198th nwellnhof 🇩🇪 808 160 871ms 25 Sep 2025 199th emplv 🇱🇻 807 125 108ms 14 Dec 2022 200th nwellnhof 🇩🇪 805 134 12ms 29 May 2023 201st saito-ta 🇯🇵 805 135 2,593ms 13 Nov 2023 202nd tomtheisen 🇺🇸 804 85 10ms 19 Jan 2021 203rd emgordon154 801 73 489ms 4 Mar 2025 204th DialFrost 🇸🇬 801 98 729ms 31 Oct 2023 205th primo-ppcg 🇹🇭 801 104 1,150ms 26 Mar 2021 206th KasperKivimaeki 🇫🇮 799 135 34ms 3 Sep 2025 207th neel11235813 797 73 65ms 6 Feb 2023 207th emgordon154 797 73 132ms 4 Mar 2025 207th fkantelberg 797 73 512ms 14 Jul 2025 210th nwellnhof 🇩🇪 796 62 1,094ms 5 Dec 2022 211th tayloia 🇬🇧 795 86 10ms 17 Jan 2023 211th pardouin 🇫🇷 795 86 28ms 27 Sep 2024 213th Kacarott 🇦🇺 793 105 70ms 13 Sep 2024 214th emgordon154 789 38 67ms 18 Nov 2025 215th stefangimmillaro 789 164 646ms 6 Oct 2025 216th jacklynnepenick 786 74 11ms 19 Aug 2021 217th clockworknazo 785 100 14ms 29 Jun 2023 218th snoozingnewt 🇨🇦 784 111 934ms 23 Nov 2025 219th stefangimmillaro 782 129 107ms 3 Oct 2023 220th Irratix 🇳🇱 782 138 13ms 17 Dec 2022 221st ovs-code 🇩🇪 780 75 480ms 15 Mar 2025 222nd ovs-code 🇩🇪 778 107 413ms 13 Sep 2023 223rd dmrichwa 🇺🇸 777 88 15ms 9 Jun 2022 223rd itsh01 777 88 11ms 14 Sep 2022 225th ovs-code 🇩🇪 776 75 52ms 15 Mar 2025 226th inventshah 776 139 2ms 17 Dec 2022 227th FlyingPenguin223 776 152 1,022ms 20 Apr 2025 228th sean-niemann 🇺🇸 775 121 545ms 22 Jul 2024 229th GrayJoKing 🇦🇺 773 112 122ms 21 Jan 2021 230th emgordon154 769 76 122ms 4 Mar 2025 231st prplz 🇦🇺 768 89 9ms 8 Feb 2021 232nd tomtheisen 🇺🇸 766 148 363ms 21 Nov 2021 233rd jared-hughes 765 141 15ms 15 Feb 2023 234th MeWhenI 🇻🇦 764 64 212ms 25 Jul 2023 235th SirBogman 🇺🇸 762 54 11ms 22 Feb 2024 236th Herbert00709 🇵🇱 762 176 146ms 20 Nov 2024 237th inventshah 762 180 281ms 19 Sep 2022 238th Waffle3z 761 155 569ms 8 Apr 2022 239th xnor-gate 756 77 14ms 7 Apr 2021 239th HPWiz 🇳🇿 756 77 12ms 2 Apr 2023 First Prev 161–240 of 1,689 Next Last