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 241st SirBogman 🇺🇸 781 54 11ms 22 Feb 2024 242nd inventshah 781 87 10ms 28 Oct 2024 242nd lifthrasiir 🇰🇷 781 87 11ms 15 Nov 2024 244th GrayJoKing 🇦🇺 780 112 122ms 21 Jan 2021 245th blaztoma 🇱🇹 778 73 52ms 23 Oct 2025 246th emgordon154 777 51 73ms 18 Nov 2025 247th prplz 🇦🇺 775 89 9ms 8 Feb 2021 247th dmrichwa 🇺🇸 775 89 15ms 8 Oct 2023 249th btjones0 773 88 18ms 17 Jan 2021 249th SirBogman 🇺🇸 773 88 11ms 5 Jan 2024 249th emgordon154 773 88 84ms 2 Apr 2025 249th Babafaba 773 88 81ms 5 Nov 2025 253rd tomtheisen 🇺🇸 773 149 363ms 21 Nov 2021 254th primo-ppcg 🇹🇭 771 48 35ms 20 May 2021 255th primo-ppcg 🇹🇭 770 87 450ms 22 Mar 2021 256th jared-hughes 770 141 15ms 15 Feb 2023 257th neel11235813 768 91 419ms 15 Jan 2024 257th CaedenHarper 🇨🇦 768 91 384ms 7 days ago 259th DialFrost 🇸🇬 767 74 103ms 1 Jun 2024 260th Herbert00709 🇵🇱 767 176 146ms 20 Nov 2024 261st inventshah 767 180 281ms 19 Sep 2022 262nd mathisfun271 764 89 17ms 4 Feb 2024 263rd scpchicken 🇵🇼 762 88 1,549ms 28 Feb 2023 264th duckyluuk 🇳🇱 760 92 430ms 10 Jul 2024 265th anter69 🇭🇺 758 111 978ms 19 Apr 2024 266th Yax42 🇫🇷 758 152 393ms 6 May 2025 267th Irratix 🇳🇱 757 75 67ms 14 Mar 2022 268th edsrzf 🇳🇿 757 151 427ms 11 hours ago 269th prplz 🇦🇺 755 90 11ms 8 Feb 2021 269th orthoplex 🇨🇽 755 90 41ms 29 Jul 2021 269th jared-hughes 755 90 33ms 15 Aug 2021 272nd MeWhenI 🇻🇦 753 153 387ms 1 Jul 2023 273rd Argeento 🇵🇱 750 92 9ms 26 Aug 2023 273rd emgordon154 750 92 11ms 2 Apr 2025 275th AlephSquirrel 747 53 78ms 3 Jan 2023 276th annaproxy 747 91 11ms 1 Feb 2022 276th neel11235813 747 91 61ms 10 Oct 2023 276th andrewjc2000 747 91 16ms 7 May 2025 276th CaedenHarper 🇨🇦 747 91 12ms 7 days ago 280th emgordon154 745 113 1,061ms 2 Apr 2025 281st Shanethegamer 🇺🇸 743 94 463ms 16 Jan 2024 282nd AlephSquirrel 742 93 11ms 16 Feb 2023 282nd helbling 🇨🇭 742 93 11ms 2 Oct 2024 284th MeWhenI 🇻🇦 741 164 158ms 21 Mar 2025 285th rak1507 🇬🇧 740 118 118ms 28 Jan 2021 286th edsrzf 🇳🇿 739 92 28ms 20 Sep 2025 286th solisolu 739 92 11ms 28 Oct 2025 288th emgordon154 738 98 126ms 2 Apr 2025 289th blaztoma 🇱🇹 737 91 2,034ms 23 Oct 2025 290th Shanethegamer 🇺🇸 735 139 1,375ms 18 Nov 2021 291st marshallward 🇺🇸 732 181 53ms 7 May 2025 292nd NewDefectus 🇮🇱 731 93 10ms 20 Dec 2021 292nd duckyluuk 🇳🇱 731 93 11ms 29 Mar 2024 294th albanian-laundromat 727 88 912ms 12 Nov 2025 295th Steffan153 🇫🇮 727 126 17ms 11 Feb 2023 296th NewDefectus 🇮🇱 725 51 35ms 23 Dec 2021 297th MeWhenI 🇻🇦 724 141 1,303ms 17 Jun 2023 298th Shanethegamer 🇺🇸 723 94 24ms 28 May 2022 298th anter69 🇭🇺 723 94 13ms 22 Jan 2023 300th DialFrost 🇸🇬 721 127 587ms 8 Mar 2024 301st janbehrens 🇩🇪 720 160 448ms 17 Jun 2023 302nd janbehrens 🇩🇪 719 96 41ms 1 Aug 2021 303rd MeWhenI 🇻🇦 719 117 864ms 11 May 2023 304th jacklynnepenick 716 95 12ms 19 Aug 2021 305th jared-hughes 710 80 365ms 9 Sep 2022 306th janbehrens 🇩🇪 708 96 103ms 17 Jun 2023 306th fkantelberg 708 96 514ms 14 Jul 2025 308th ovs-code 🇩🇪 704 130 719ms 14 Mar 2025 309th SirBogman 🇺🇸 701 81 40ms 5 Jan 2024 310th quimey 701 97 88ms 16 Mar 2023 311th Yewzir 🇧🇪 701 711 8ms 19 Dec 2024 312th DialFrost 🇸🇬 699 105 579ms 7 Jun 2024 313th croc54 694 98 61ms 14 Jan 2025 314th MeWhenI 🇻🇦 693 147 209ms 14 Oct 2022 315th emgordon154 692 82 56ms 2 Apr 2025 316th emplv 🇱🇻 688 195 276ms 13 Dec 2022 317th stertooy 🇧🇪 687 99 74ms 16 Jun 2024 318th MeWhenI 🇻🇦 685 102 489ms 24 May 2024 319th stefangimmillaro 684 220 1,040ms 19 Aug 2023 320th MeWhenI 🇻🇦 683 134 12ms 2 Oct 2022 First Prev 241–320 of 1,706 Next Last