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 241st SirBogman 🇺🇸 781 54 11ms 22 Feb 2024 242nd GrayJoKing 🇦🇺 780 112 122ms 21 Jan 2021 243rd blaztoma 🇱🇹 778 73 45ms 23 Oct 2025 244th emgordon154 777 51 73ms 18 Nov 2025 245th prplz 🇦🇺 775 89 9ms 8 Feb 2021 245th dmrichwa 🇺🇸 775 89 15ms 8 Oct 2023 247th btjones0 773 88 18ms 17 Jan 2021 247th SirBogman 🇺🇸 773 88 11ms 5 Jan 2024 247th emgordon154 773 88 84ms 2 Apr 2025 247th Babafaba 773 88 81ms 5 Nov 2025 251st tomtheisen 🇺🇸 773 149 363ms 21 Nov 2021 252nd primo-ppcg 🇹🇭 771 48 35ms 20 May 2021 253rd primo-ppcg 🇹🇭 770 87 450ms 22 Mar 2021 254th jared-hughes 770 141 15ms 15 Feb 2023 255th DialFrost 🇸🇬 768 74 103ms 1 Jun 2024 256th neel11235813 768 91 419ms 15 Jan 2024 256th CaedenHarper 🇨🇦 768 91 384ms 12 days ago 258th Herbert00709 🇵🇱 767 176 146ms 20 Nov 2024 259th inventshah 767 180 281ms 19 Sep 2022 260th mathisfun271 764 89 17ms 4 Feb 2024 261st scpchicken 🇵🇼 762 88 1,549ms 28 Feb 2023 262nd duckyluuk 🇳🇱 760 92 430ms 10 Jul 2024 263rd anter69 🇭🇺 758 111 978ms 19 Apr 2024 264th Yax42 🇫🇷 758 152 393ms 6 May 2025 265th Irratix 🇳🇱 757 75 67ms 14 Mar 2022 266th edsrzf 🇳🇿 757 151 427ms 5 days ago 267th prplz 🇦🇺 755 90 11ms 8 Feb 2021 267th orthoplex 🇨🇽 755 90 41ms 29 Jul 2021 267th jared-hughes 755 90 33ms 15 Aug 2021 270th MeWhenI 🇻🇦 753 153 387ms 1 Jul 2023 271st Argeento 🇵🇱 750 92 9ms 26 Aug 2023 271st emgordon154 750 92 11ms 2 Apr 2025 273rd AlephSquirrel 747 53 78ms 3 Jan 2023 274th annaproxy 747 91 11ms 1 Feb 2022 274th neel11235813 747 91 61ms 10 Oct 2023 274th andrewjc2000 747 91 16ms 7 May 2025 274th CaedenHarper 🇨🇦 747 91 12ms 12 days ago 278th emgordon154 745 113 1,061ms 2 Apr 2025 279th Shanethegamer 🇺🇸 744 94 463ms 16 Jan 2024 280th AlephSquirrel 742 93 11ms 16 Feb 2023 280th helbling 🇨🇭 742 93 11ms 2 Oct 2024 282nd MeWhenI 🇻🇦 741 164 158ms 21 Mar 2025 283rd rak1507 🇬🇧 740 118 118ms 28 Jan 2021 284th edsrzf 🇳🇿 739 92 28ms 20 Sep 2025 284th solisolu 739 92 11ms 28 Oct 2025 286th emgordon154 738 98 126ms 2 Apr 2025 287th blaztoma 🇱🇹 737 91 2,034ms 23 Oct 2025 288th Shanethegamer 🇺🇸 735 139 1,375ms 18 Nov 2021 289th marshallward 🇺🇸 732 181 53ms 7 May 2025 290th NewDefectus 🇮🇱 731 93 10ms 20 Dec 2021 290th duckyluuk 🇳🇱 731 93 11ms 29 Mar 2024 292nd albanian-laundromat 727 88 912ms 12 Nov 2025 293rd Steffan153 🇫🇮 727 126 17ms 11 Feb 2023 294th NewDefectus 🇮🇱 725 51 35ms 23 Dec 2021 295th MeWhenI 🇻🇦 724 141 1,303ms 17 Jun 2023 296th Shanethegamer 🇺🇸 723 94 24ms 28 May 2022 296th anter69 🇭🇺 723 94 13ms 22 Jan 2023 298th DialFrost 🇸🇬 721 127 587ms 8 Mar 2024 299th janbehrens 🇩🇪 720 160 448ms 17 Jun 2023 300th janbehrens 🇩🇪 719 96 41ms 1 Aug 2021 301st MeWhenI 🇻🇦 719 117 864ms 11 May 2023 302nd jacklynnepenick 716 95 12ms 19 Aug 2021 303rd jared-hughes 710 80 365ms 9 Sep 2022 304th janbehrens 🇩🇪 708 96 103ms 17 Jun 2023 304th fkantelberg 708 96 514ms 14 Jul 2025 306th ovs-code 🇩🇪 704 130 719ms 14 Mar 2025 307th SirBogman 🇺🇸 701 81 40ms 5 Jan 2024 308th quimey 701 97 88ms 16 Mar 2023 309th Yewzir 🇧🇪 701 711 8ms 19 Dec 2024 310th DialFrost 🇸🇬 699 105 579ms 7 Jun 2024 311th croc54 694 98 61ms 14 Jan 2025 312th emgordon154 693 82 56ms 2 Apr 2025 313th MeWhenI 🇻🇦 693 147 209ms 14 Oct 2022 314th emplv 🇱🇻 688 195 276ms 13 Dec 2022 315th stertooy 🇧🇪 687 99 74ms 16 Jun 2024 316th MeWhenI 🇻🇦 686 102 489ms 24 May 2024 317th stefangimmillaro 684 220 1,040ms 19 Aug 2023 318th MeWhenI 🇻🇦 683 134 12ms 2 Oct 2022 319th argusdusty 🇺🇸 680 100 11ms 25 Mar 2021 319th nstearns96 🇬🇧 680 100 318ms 21 Jan 2023 First Prev 241–320 of 1,710 Next Last