The Calendar hole will go live in approximately 9 days. Why not try and solve it ahead of time?
Kolakoski Sequence 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 641st Waffle3z 781 54 37ms 19 Jan 2021 641st olivermrose 🇺🇸 781 54 42ms 28 Sep 2021 641st KatieLG 🇬🇧 781 54 38ms 9 Jan 2023 641st Andriamanitra 🇫🇮 781 54 47ms 20 Jul 2023 645th GrayJoKing 🇦🇺 781 68 2ms 21 Jan 2021 645th m-tkach 🇺🇦 781 68 5ms 25 Apr 2022 645th MeWhenI 🇻🇦 781 68 2ms 11 Nov 2022 648th janbehrens 🇩🇪 781 91 64ms 20 Nov 2022 648th snyderek 🇺🇸 781 91 62ms 21 Nov 2024 648th dokutan 781 91 83ms 18 Jul 2025 651st DialFrost 🇸🇬 780 142 1,630ms 13 Sep 2025 652nd MeWhenI 🇻🇦 779 88 416ms 28 Feb 2022 653rd Shanethegamer 🇺🇸 778 106 33ms 20 Jan 2025 654th rak1507 🇬🇧 777 60 9ms 20 Jan 2021 654th Shanethegamer 🇺🇸 777 60 9ms 26 Sep 2021 654th duckyluuk 🇳🇱 777 60 9ms 4 Oct 2024 657th anter69 🇭🇺 776 59 982ms 24 Feb 2023 657th SirBogman 🇺🇸 776 59 1,152ms 10 Jun 2024 659th scpchicken 🇵🇼 774 48 3ms 15 Dec 2022 660th commandblockguy 🇺🇸 774 62 425ms 15 Jan 2024 660th HumanoidCPU 774 62 358ms 3 Jun 2024 662nd ovs-code 🇩🇪 774 142 12ms 31 Mar 2023 663rd GrayJoKing 🇦🇺 771 55 135ms 6 Aug 2024 664th Shanethegamer 🇺🇸 771 89 457ms 26 Jul 2023 665th mousetail 🇳🇱 771 98 116ms 3 Oct 2024 666th NewDefectus 🇮🇱 770 24 4ms 25 Oct 2021 667th MeWhenI 🇻🇦 770 47 259ms 28 Jan 2023 668th RDShah 770 64 10ms 17 Jan 2021 668th andre-lameirinhas 🇵🇹 770 64 10ms 22 Feb 2021 668th stertooy 🇧🇪 770 64 10ms 10 Jun 2024 668th Terobero 770 64 20ms 6 Sep 2024 668th moustave 770 64 11ms 5 May 2025 668th Code-Coder-coder 770 64 11ms 27 days ago 668th Lv0Sys 🇵🇱 770 64 10ms 17 days ago 675th LostSyntax21 🇬🇧 767 55 62ms 2 Oct 2024 676th MeWhenI 🇻🇦 767 89 104ms 25 Dec 2022 677th Steffan153 🇫🇮 765 51 80ms 18 Dec 2022 678th retrohun 765 63 102ms 23 Jan 2023 679th Shanethegamer 🇺🇸 765 65 108ms 22 May 2021 680th lynn 765 78 150ms 16 Nov 2021 681st Waffle3z 764 61 9ms 20 Jan 2021 681st didion0 🇺🇸 764 61 9ms 9 Feb 2021 681st KrausRaus 🇺🇸 764 61 10ms 19 Feb 2021 681st tayloia 🇬🇧 764 61 8ms 29 May 2022 685th Shanethegamer 🇺🇸 764 93 68ms 12 Jan 2022 686th MeWhenI 🇻🇦 764 108 27ms 7 Jun 2023 687th SirBogman 🇺🇸 763 31 46ms 7 Oct 2022 688th Shanethegamer 🇺🇸 763 60 430ms 2 Jul 2021 688th alemelis 763 60 2,138ms 14 Aug 2024 690th dokutan 762 63 390ms 1 Apr 2025 691st DialFrost 🇸🇬 762 86 5ms 10 Oct 2023 692nd albanian-laundromat 759 60 718ms 1 Oct 2025 693rd c0d3-4-F00d 🇩🇪 759 70 2ms 18 Mar 2022 693rd Alex-x90 🇺🇸 759 70 2ms 6 Mar 2023 693rd dokutan 759 70 5ms 18 Jul 2025 696th SirBogman 🇺🇸 759 86 115ms 24 Jan 2021 696th strout 759 86 124ms 15 Dec 2023 698th TobyBoyne 🇬🇧 758 65 10ms 21 Jan 2021 698th 77Tigers 758 65 30ms 1 Mar 2021 698th knutae 🇳🇴 758 65 10ms 29 Jun 2021 698th ehulinsky 🇺🇸 758 65 13ms 10 Nov 2021 698th guilhem-roy 🇫🇷 758 65 10ms 28 Feb 2022 698th martinnorling 🇸🇪 758 65 10ms 8 Mar 2022 698th IshanPanpaliya 758 65 10ms 3 May 2023 698th nooberitess 758 65 11ms 8 Apr 2025 706th GolfingSuccess 🇬🇷 758 71 6ms 16 Oct 2023 706th Yewzir 🇧🇪 758 71 3ms 19 Nov 2025 708th kcinnu 🇱🇹 758 146 1,731ms 17 May 2024 709th duckyluuk 🇳🇱 756 73 7ms 16 Dec 2024 710th Shanethegamer 🇺🇸 754 63 4ms 13 Aug 2024 710th emgordon154 754 63 4ms 25 Aug 2024 712th ovs-code 🇩🇪 754 87 106ms 8 Mar 2024 713th lynn 753 85 1,315ms 12 Sep 2021 714th ScottHamper 752 62 9ms 1 Jun 2021 714th helbling 🇨🇭 752 62 10ms 2 Oct 2024 716th RockOfStone 752 81 2ms 4 Nov 2021 716th dokutan 752 81 2ms 18 Jul 2025 718th Mabeloid 🇳🇴 750 64 539ms 17 Sep 2024 719th cipharius 750 87 198ms 19 Jan 2021 720th Lydxn 🇨🇦 750 223 13ms 24 Jun 2021 First Prev 641–720 of 1,872 Next Last