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 321st Mabeloid 🇳🇴 657 236 122ms 26 Oct 2025 322nd Shanethegamer 🇺🇸 656 90 602ms 18 Jan 2023 323rd MeWhenI 🇻🇦 656 209 2ms 10 Sep 2022 324th mathisfun271 654 89 17ms 4 Feb 2024 325th dokutan 653 210 2ms 27 Mar 2024 326th Irratix 🇳🇱 652 75 67ms 14 Mar 2022 327th Shanethegamer 🇺🇸 652 128 97ms 16 Dec 2022 328th duckyluuk 🇳🇱 652 147 3,928ms 28 Oct 2024 329th marcin7Cd 652 174 1,074ms 9 Feb 2021 329th Shanethegamer 🇺🇸 652 174 171ms 28 May 2022 331st Shanethegamer 🇺🇸 651 144 517ms 7 Jun 2022 331st MeWhenI 🇻🇦 651 144 460ms 14 Oct 2022 333rd DialFrost 🇸🇬 649 105 579ms 7 Jun 2024 334th annaproxy 649 121 1,814ms 24 Dec 2022 335th prplz 🇦🇺 646 90 11ms 8 Feb 2021 335th jared-hughes 646 90 33ms 15 Aug 2021 337th GolfingSuccess 🇬🇷 642 91 418ms 25 Jan 2025 337th CaedenHarper 🇨🇦 642 91 384ms 7 days ago 339th janbehrens 🇩🇪 642 146 619ms 24 Mar 2022 340th Natanaelel 🇸🇪 641 135 146ms 9 May 2024 341st primo-ppcg 🇹🇭 640 202 668ms 3 Aug 2021 342nd dokutan 640 234 90ms 23 Jul 2025 343rd andrewjc2000 639 91 16ms 7 May 2025 343rd CaedenHarper 🇨🇦 639 91 12ms 7 days ago 345th alexsave 639 107 21ms 15 Nov 2025 346th Yewzir 🇧🇪 635 216 2ms 18 Jan 2024 347th lynn 633 124 1,059ms 16 Nov 2021 348th MichalMarsalek 🇨🇿 633 361 4ms 27 Nov 2022 349th GolfingSuccess 🇬🇷 632 92 92ms 25 Jan 2021 349th edsrzf 🇳🇿 632 92 28ms 20 Sep 2025 349th solisolu 632 92 11ms 28 Oct 2025 352nd snoozingnewt 🇨🇦 631 237 324ms 27 days ago 353rd MeWhenI 🇻🇦 627 210 107ms 29 Apr 2025 354th NewDefectus 🇮🇱 626 93 10ms 20 Dec 2021 355th SirBogman 🇺🇸 625 48 77ms 28 Sep 2022 356th Herbert00709 🇵🇱 624 173 3ms 5 Apr 2024 357th janbehrens 🇩🇪 619 209 417ms 17 Jun 2023 358th emgordon154 618 147 54ms 13 Dec 2024 359th elgan65536 613 253 120ms 11 Nov 2023 360th jared-hughes 611 80 365ms 9 Sep 2022 361st KatieLG 🇬🇧 609 96 401ms 28 Oct 2024 362nd TimCurwick 🇺🇸 609 112 605ms 26 Jan 2021 363rd janbehrens 🇩🇪 606 96 103ms 17 Jun 2023 363rd KatieLG 🇬🇧 606 96 41ms 29 Jul 2024 365th didion0 🇺🇸 605 113 47ms 6 May 2021 366th ovs-code 🇩🇪 604 130 719ms 14 Mar 2025 367th o0lit3 🇺🇸 602 70 186ms 15 Sep 2021 368th SirBogman 🇺🇸 601 223 74ms 3 Jan 2022 369th quimey 600 97 88ms 16 Mar 2023 370th KatieLG 🇬🇧 599 382 3ms 12 Oct 2021 371st emgordon154 596 82 56ms 2 Apr 2025 371st KatieLG 🇬🇧 596 82 531ms 2 Oct 2025 373rd croc54 594 98 61ms 14 Jan 2025 374th Waffle3z 594 385 4ms 31 Jan 2021 375th annaproxy 593 146 557ms 28 Jul 2022 376th janbehrens 🇩🇪 591 100 431ms 1 Nov 2021 377th stertooy 🇧🇪 588 99 74ms 16 Jun 2024 377th luuumine 🇫🇷 588 99 38ms 9 Oct 2025 379th SirFireball3521 587 84 157ms 1 Mar 2023 380th stefangimmillaro 587 224 106ms 18 Sep 2023 381st MeWhenI 🇻🇦 587 264 160ms 16 Mar 2022 382nd MeWhenI 🇻🇦 586 134 12ms 2 Oct 2022 383rd GeorgeStechman 🇬🇧 584 117 15ms 17 Nov 2022 384th argusdusty 🇺🇸 582 100 11ms 25 Mar 2021 384th nstearns96 🇬🇧 582 100 318ms 21 Jan 2023 384th adamnielson42 🇺🇸 582 100 79ms 8 Nov 2023 387th Shanethegamer 🇺🇸 582 143 1,058ms 8 Apr 2021 388th MeWhenI 🇻🇦 580 196 4ms 12 Aug 2024 389th kmathis22 580 223 681ms 12 days ago 390th KatieLG 🇬🇧 579 118 18ms 5 Oct 2025 391st Shanethegamer 🇺🇸 575 85 108ms 8 Apr 2021 392nd MeWhenI 🇻🇦 573 102 489ms 24 May 2024 393rd Yewzir 🇧🇪 573 234 67ms 22 Dec 2023 394th dokutan 572 199 4ms 12 Aug 2024 395th BREMAUCY 🇫🇷 570 102 11ms 19 Jul 2025 396th AlephSquirrel 566 53 78ms 3 Jan 2023 397th RockOfStone 563 213 2,065ms 4 Nov 2021 398th stefangimmillaro 560 171 4,299ms 19 Nov 2024 399th m-tkach 🇺🇦 559 240 82ms 17 Dec 2022 400th Natanaelel 🇸🇪 556 88 65ms 10 Sep 2021 First Prev 321–400 of 1,685 Next Last