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 401st dokutan 556 217 105ms 28 Mar 2024 402nd jatloe 554 105 56ms 26 Sep 2024 403rd MeWhenI 🇻🇦 553 238 274ms 10 Feb 2023 404th dokutan 552 243 436ms 19 Aug 2024 405th Shanethegamer 🇺🇸 548 158 301ms 20 May 2022 406th dokutan 548 236 452ms 24 Sep 2025 407th dokutan 546 107 428ms 21 Mar 2025 408th AkashTandon167 544 107 11ms 1 Nov 2021 408th dokutan 544 107 38ms 21 Mar 2025 408th blaztoma 🇱🇹 544 107 32ms 13 Oct 2025 411th olivermrose 🇺🇸 543 90 104ms 28 Oct 2021 411th BrenSchaap 543 90 86ms 13 Nov 2021 413th CaedenHarper 🇨🇦 541 243 274ms 17 Nov 2025 414th MeWhenI 🇻🇦 540 78 40ms 28 Feb 2025 415th dokutan 540 222 1ms 3 Apr 2024 416th nullie 539 108 115ms 9 Jun 2022 417th edsrzf 🇳🇿 539 177 118ms 20 Dec 2024 418th CaedenHarper 🇨🇦 539 240 740ms 16 Oct 2025 419th snoozingnewt 🇨🇦 537 110 409ms 14 Oct 2025 420th Yewzir 🇧🇪 537 245 265ms 3 Jan 2024 421st dokutan 535 427 4ms 8 Dec 2023 422nd marcin7Cd 534 109 12ms 9 Feb 2021 422nd OllieBoyne 🇬🇧 534 109 152ms 25 May 2022 422nd scpchicken 🇵🇼 534 109 12ms 28 Feb 2023 422nd CutSandstone 534 109 34ms 8 Jul 2024 426th msbranicky 532 247 318ms 3 Oct 2023 426th stefangimmillaro 532 247 433ms 13 Dec 2024 428th dokutan 532 371 499ms 13 Jan 2025 429th scpchicken 🇵🇼 531 93 1,705ms 17 Feb 2023 430th pschmid0 🇺🇸 531 182 188ms 9 Oct 2022 431st jerrandolph 530 248 745ms 26 Sep 2025 432nd qpwoeirut 529 110 295ms 11 Aug 2025 432nd Lv0Sys 🇵🇱 529 110 10ms 13 days ago 434th Yewzir 🇧🇪 529 228 105ms 6 Jul 2023 435th SirBogman 🇺🇸 526 205 12ms 2 Jan 2022 436th dokutan 526 250 267ms 6 Jan 2024 437th m-tkach 🇺🇦 526 570 25ms 20 Jan 2024 438th CedricGebistorf 524 111 10ms 9 Mar 2022 439th coreynash 522 131 30ms 24 Oct 2023 440th lynn 522 574 28ms 6 Aug 2023 441st Lv0Sys 🇵🇱 520 94 59ms 13 days ago 442nd Shanethegamer 🇺🇸 519 249 664ms 25 Sep 2025 443rd MeWhenI 🇻🇦 518 114 441ms 15 Feb 2023 444th CaedenHarper 🇨🇦 518 219 401ms 26 Oct 2025 445th namelessiw 517 113 457ms 5 Mar 2024 446th rschwa6308 🇺🇸 515 113 12ms 28 Jun 2021 446th namelessiw 515 113 12ms 11 Jan 2024 446th FortuiteMan 🇫🇷 515 113 73ms 19 mins ago 449th johndevou 514 210 33ms 18 Nov 2021 450th commandblockguy 🇺🇸 513 114 516ms 15 Jan 2024 451st MeWhenI 🇻🇦 513 239 209ms 3 Dec 2021 452nd lifthrasiir 🇰🇷 511 578 8ms 19 Dec 2024 453rd MeWhenI 🇻🇦 510 588 30ms 6 Jun 2023 454th Yewzir 🇧🇪 509 223 5ms 18 Feb 2024 455th dokutan 507 242 206ms 1 Jul 2025 456th RaBa21 🇭🇺 506 115 20ms 1 Aug 2025 457th CatsAreFluffy 504 116 432ms 15 Jan 2024 457th JunkIce 504 116 365ms 7 Mar 2025 459th dokutan 502 226 5ms 11 Jan 2024 460th petroselo 501 116 10ms 16 Nov 2021 460th amollberg 🇸🇪 501 116 23ms 30 Jan 2022 460th CatsAreFluffy 501 116 15ms 10 Jan 2023 460th JunkIce 501 116 19ms 7 Mar 2025 460th robin-scragg 501 116 72ms 21 Oct 2025 465th tomh1012 500 227 444ms 18 Sep 2025 466th cros107 🇦🇺 493 118 47ms 16 Sep 2025 467th CaedenHarper 🇨🇦 491 128 823ms 9 Sep 2025 468th m-tkach 🇺🇦 486 222 2ms 17 Dec 2022 468th Yewzir 🇧🇪 486 222 2ms 22 Dec 2023 470th knutae 🇳🇴 485 120 11ms 29 Jun 2021 471st two-bad 🇬🇧 485 141 818ms 25 Feb 2024 472nd Waffle3z 484 101 80ms 17 Jan 2021 473rd Yewzir 🇧🇪 482 362 2,344ms 14 Nov 2025 474th yzhs 🇩🇪 481 180 139ms 24 Jul 2021 475th frosster 480 250 1ms 13 Mar 2025 476th guilhem-roy 🇫🇷 477 122 11ms 28 Feb 2022 476th inverseLorentz 🇦🇺 477 122 108ms 24 Oct 2023 478th alemelis 473 125 2,374ms 14 Aug 2024 479th dokutan 471 229 1ms 1 May 2024 480th neihousaigaai 470 275 565ms 5 Jan 2022 First Prev 401–480 of 1,685 Next Last