The Calendar hole will go live in approximately 11 days. Why not try and solve it ahead of time?
Catalan Numbers in Python 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 315th dahappy1989 587 75 9ms 5 Nov 2023 322nd jacklynnepenick 579 76 9ms 15 Feb 2022 322nd hiichbindermax 579 76 12ms 25 Feb 2022 322nd Andrey135296 579 76 10ms 4 Apr 2022 322nd myleopard 579 76 10ms 20 Jul 2022 322nd julian-hoelz 579 76 10ms 23 Sep 2024 327th dzshn 571 77 9ms 15 Aug 2022 327th S-Ruban 571 77 9ms 25 Feb 2023 327th NickTheEASDude 🇺🇸 571 77 9ms 1 May 2024 327th jamesthekee 571 77 10ms 16 Apr 2025 327th 40fied4t 571 77 10ms 17 May 2025 332nd amollberg 🇸🇪 564 78 10ms 29 Jan 2022 332nd ArmaanAS 564 78 17ms 22 Feb 2022 332nd lukemalek 564 78 9ms 10 Oct 2022 332nd Bodo171 564 78 10ms 7 Dec 2022 332nd bobbysq 564 78 9ms 20 Dec 2022 332nd marcin7Cd 564 78 10ms 24 Mar 2023 332nd TheZwierzLF 🇵🇱 564 78 11ms 17 May 2025 339th trist224 🇫🇷 557 79 11ms 26 Aug 2022 339th CatsAreFluffy 557 79 10ms 2 Sep 2023 339th yuchuehw 557 79 17ms 6 Feb 2024 342nd pyrolitic 🇮🇪 550 80 9ms 6 Apr 2022 342nd andre-lameirinhas 🇵🇹 550 80 9ms 13 Aug 2022 342nd grhkm21 550 80 9ms 19 Dec 2022 342nd Florian-Mt 550 80 10ms 26 Sep 2023 346th abba23 543 81 11ms 1 Jun 2022 346th tpremoli 543 81 16ms 8 Mar 2023 346th ridingqwerty 🇺🇸 543 81 10ms 7 Feb 2024 346th willschremmer 543 81 10ms 28 Apr 2024 346th PyryL 🇫🇮 543 81 10ms 23 Aug 2024 351st twocatsinatrenchcoat 537 82 10ms 3 Feb 2022 351st hjcafaroUC 537 82 10ms 15 Aug 2022 351st AodhanDalton 537 82 11ms 2 Sep 2022 351st loganmacdougall 🇨🇦 537 82 10ms 16 Nov 2022 351st goGuru 537 82 11ms 2 Jan 2023 351st latvianfarmer17 🇱🇻 537 82 9ms 20 Jul 2023 357th felixcroc 524 84 10ms 28 Mar 2023 357th Mr-McChicken 524 84 10ms 15 Oct 2023 359th ehulinsky 🇺🇸 518 85 17ms 8 May 2023 359th RaBa21 🇭🇺 518 85 23ms 19 Jul 2025 361st brimstonetrader 512 86 9ms 10 Jan 2024 361st Andrey2001 512 86 10ms 23 days ago 363rd za3k 506 87 11ms 11 Oct 2022 363rd ComputerKWasTaken 🇺🇸 506 87 10ms 24 Sep 2024 365th shibacho 🇯🇵 500 88 9ms 24 Mar 2022 365th Wildst 500 88 10ms 23 Sep 2022 365th jaxmattfair 🇺🇸 500 88 17ms 22 May 2024 365th rsujeevan 500 88 10ms 5 May 2025 365th JOrE-Softwares 500 88 9ms 23 May 2025 365th Aquateraneal 500 88 9ms 4 Nov 2025 371st MassimoParisi 494 89 17ms 25 Sep 2024 372nd ItsEthanXYZ 484 91 10ms 14 Mar 2024 372nd elana-teal 484 91 11ms 2 Jul 2025 374th Trunksistor 🇫🇷 468 94 9ms 25 May 2022 374th hymanimy 468 94 9ms 24 Nov 2022 376th 1231234md5 🇨🇳 440 100 10ms 11 Dec 2023 376th roguh 🇬🇹 440 100 9ms 9 Jun 2024 378th Ugoran 436 101 10ms 19 Nov 2022 378th NoneTheFewer 436 101 9ms 17 May 2024 380th Andre3582 431 102 10ms 13 Mar 2022 380th griffinschreiber 431 102 10ms 25 Jun 2023 382nd XenThe 🇬🇧 423 104 10ms 6 Nov 2025 383rd galloj 🇨🇿 419 105 10ms 16 Aug 2022 383rd BabySharkHi 419 105 10ms 22 Apr 2025 385th ImpressedByRocks 407 108 12ms 24 Jun 2022 385th Jacob385 407 108 10ms 15 Mar 2024 387th TJK-S 404 109 9ms 16 Oct 2025 388th feherd 386 114 9ms 20 May 2022 389th martinnorling 🇸🇪 376 117 12ms 29 Jan 2022 389th firegene 🇮🇪 376 117 9ms 1 Aug 2024 391st jstechman 370 119 11ms 26 Feb 2024 392nd atazzam 🇺🇸 364 121 11ms 5 Mar 2022 393rd Zach10za 341 129 41ms 21 Nov 2022 393rd spy404 🇮🇷 341 129 10ms 5 Jun 2024 395th Bananapants22 295 149 12ms 26 Aug 2022 395th yhm138 295 149 12ms 16 Feb 2025 397th Azearia 288 153 15ms 7 Sep 2023 398th dillon-duncando 268 164 15ms 19 Oct 2022 398th Pablosh234 268 164 11ms 19 Dec 2024 400th Upload-and-View 🇺🇦 257 171 10ms 19 Aug 2025 First Prev 321–400 of 418 Next Last