The Calendar hole will go live in approximately 8 days. Why not try and solve it ahead of time?
Catalan’s 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 MeWhenI 🇻🇦 649 225 76ms 4 Jun 2022 322nd jared-hughes 648 70 38ms 20 Jan 2023 322nd stefangimmillaro 648 70 63ms 30 Dec 2024 324th MeWhenI 🇻🇦 648 126 47ms 14 Feb 2025 325th MeWhenI 🇻🇦 646 284 158ms 5 Feb 2022 326th Yewzir 🇧🇪 644 245 290ms 3 Jan 2024 327th dokutan 643 227 90ms 23 Jul 2025 328th saito-ta 🇯🇵 640 172 2,659ms 3 Dec 2024 329th msbranicky 639 70 299ms 12 Jan 2024 330th dokutan 639 247 273ms 4 Jan 2024 331st Bubbler-4 638 65 44ms 4 Jan 2022 332nd Fvirgilio 638 93 10ms 10 May 2025 332nd FortuiteMan 🇫🇷 638 93 104ms 26 Sep 2025 334th DialFrost 🇸🇬 626 91 386ms 22 Jan 2024 335th KatieLG 🇬🇧 625 366 4ms 30 Sep 2025 336th yuchuehw 621 72 2,612ms 2 Jun 2024 337th MeWhenI 🇻🇦 619 92 396ms 17 Jan 2024 337th Shanethegamer 🇺🇸 619 92 431ms 18 Jan 2024 339th inventshah 618 96 56ms 20 Dec 2022 340th sisyphus-ppcg 🇦🇺 612 97 57ms 13 Jan 2023 340th scpchicken 🇵🇼 612 97 11ms 28 Feb 2023 342nd jared-hughes 612 276 504ms 24 Sep 2025 343rd stefangimmillaro 610 259 306ms 30 Dec 2024 344th MeWhenI 🇻🇦 609 92 139ms 3 Aug 2024 345th nstearns96 🇬🇧 605 98 12ms 21 Jan 2023 346th MeWhenI 🇻🇦 603 129 1,239ms 14 Jun 2023 347th edsrzf 🇳🇿 603 134 94ms 22 Nov 2025 348th janbehrens 🇩🇪 602 187 545ms 2 Jan 2022 349th adamnielson42 🇺🇸 599 99 18ms 24 Aug 2023 350th SirBogman 🇺🇸 598 107 24ms 2 Jan 2022 351st Yewzir 🇧🇪 597 234 75ms 22 Dec 2023 352nd annaproxy 596 96 1,817ms 27 Oct 2023 353rd neel11235813 593 100 99ms 15 Jan 2023 353rd SB-945 593 100 13ms 22 Jan 2024 355th FortuiteMan 🇫🇷 591 152 37ms 30 Sep 2025 356th MeWhenI 🇻🇦 588 79 25ms 15 Feb 2025 357th RaBa21 🇭🇺 587 101 193ms 1 Aug 2025 358th janbehrens 🇩🇪 587 169 766ms 24 Mar 2022 359th KatieLG 🇬🇧 582 102 192ms 2 Oct 2025 360th dokutan 582 240 454ms 19 Aug 2024 361st neel11235813 581 98 442ms 27 Mar 2024 362nd trinityy-7 577 111 347ms 23 Jan 2024 362nd alexsave 577 111 17ms 6 Nov 2025 364th MeWhenI 🇻🇦 577 140 843ms 28 Jun 2023 365th Shanethegamer 🇺🇸 576 135 1,316ms 12 Feb 2023 365th SirBogman 🇺🇸 576 135 1,280ms 24 Jan 2024 367th DialFrost 🇸🇬 574 79 209ms 1 Jun 2024 368th h3ra993huskp 🇯🇵 573 295 426ms 23 days ago 369th dokutan 572 214 102ms 28 Mar 2024 370th yzhs 🇩🇪 571 104 90ms 22 Jun 2022 370th ryyyn 🇺🇸 571 104 31ms 16 Nov 2025 372nd Yewzir 🇧🇪 569 222 1ms 22 Dec 2023 373rd Shanethegamer 🇺🇸 567 80 40ms 28 May 2022 373rd annaproxy 567 80 41ms 27 Aug 2022 375th InigoK 🇺🇸 565 105 486ms 14 Aug 2025 376th saito-ta 🇯🇵 561 57 85ms 19 Aug 2022 377th anter69 🇭🇺 560 81 452ms 13 Feb 2024 378th heanyang1 559 80 306ms 29 May 2025 379th dokutan 559 226 2ms 1 May 2024 380th mathisfun271 555 107 23ms 3 Feb 2024 381st NewDefectus 🇮🇱 553 84 16ms 6 Jan 2022 382nd guilhem-roy 🇫🇷 549 108 54ms 3 Mar 2022 382nd andrewjc2000 549 108 54ms 6 Aug 2025 384th Natanaelel 🇸🇪 548 138 1,517ms 12 Jun 2025 385th neihousaigaai 548 308 664ms 5 Jan 2022 386th AlephSquirrel 547 117 18ms 15 Feb 2023 387th davecame 544 109 39ms 28 Nov 2023 388th Yax42 🇫🇷 544 207 612ms 17 days ago 389th Shanethegamer 🇺🇸 543 173 34ms 30 Aug 2024 390th CaedenHarper 🇨🇦 541 208 1,072ms 21 Oct 2025 391st Command-Master 539 110 50ms 28 Sep 2023 392nd targrik 538 119 55ms 17 Feb 2025 392nd KatieLG 🇬🇧 538 119 462ms 5 Oct 2025 394th Yewzir 🇧🇪 537 228 102ms 6 Jul 2023 395th RDShah 535 111 168ms 12 Jun 2022 396th Waffle3z 526 219 2ms 6 Jan 2022 396th dokutan 526 219 1ms 3 Apr 2024 398th NewDefectus 🇮🇱 525 79 42ms 4 Jan 2022 399th AlephSquirrel 525 113 29ms 16 Jan 2024 399th CaedenHarper 🇨🇦 525 113 80ms 13 Aug 2025 First Prev 321–400 of 1,673 Next Last