The Calendar hole will go live in approximately 13 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 240th FlorianCassayre 🇫🇷 751 79 78ms 26 Sep 2023 242nd tomtheisen 🇺🇸 750 150 432ms 10 Jan 2023 243rd DialFrost 🇸🇬 748 108 883ms 31 Oct 2023 244th MeWhenI 🇻🇦 747 226 460ms 7 Nov 2025 245th Shanethegamer 🇺🇸 745 107 955ms 26 May 2022 246th MeWhenI 🇻🇦 743 61 69ms 24 Aug 2022 247th elgan65536 740 248 122ms 11 Nov 2023 247th acotis 740 248 221ms 31 Oct 2025 249th Steffan153 🇫🇮 737 135 105ms 18 Feb 2024 250th MeWhenI 🇻🇦 735 87 12ms 2 Jan 2022 250th didion0 🇺🇸 735 87 11ms 25 Jan 2022 252nd CLOStrophobic 🇮🇹 734 128 2,017ms 22 Feb 2025 253rd 5cw 🇺🇸 733 81 13ms 28 Aug 2025 254th emplv 🇱🇻 732 136 105ms 7 Dec 2022 255th nwellnhof 🇩🇪 731 62 1,267ms 2 Jan 2022 256th edsrzf 🇳🇿 729 112 84ms 25 days ago 257th MeWhenI 🇻🇦 728 706 9ms 28 Nov 2023 258th lynn 727 104 254ms 14 Apr 2023 259th primo-ppcg 🇹🇭 724 79 58ms 30 Jan 2022 260th anter69 🇭🇺 724 82 79ms 13 Feb 2024 260th duckyluuk 🇳🇱 724 82 90ms 15 Aug 2024 260th emgordon154 724 82 90ms 3 Jul 2025 263rd DialFrost 🇸🇬 724 88 344ms 7 Jun 2024 264th ovs-code 🇩🇪 724 127 833ms 8 days ago 265th dokutan 724 233 529ms 24 Sep 2025 266th albanian-laundromat 723 206 2ms 25 Jun 2025 267th clockworknazo 722 112 905ms 30 Oct 2023 268th m-tkach 🇺🇦 720 263 26ms 20 Jun 2022 269th dokutan 719 207 2ms 27 Mar 2024 270th ovs-code 🇩🇪 718 78 132ms 14 Feb 2025 271st sean-niemann 🇺🇸 718 235 458ms 24 Sep 2025 272nd primo-ppcg 🇹🇭 715 58 36ms 14 Jan 2022 273rd nwellnhof 🇩🇪 715 83 639ms 6 Jan 2022 273rd commandblockguy 🇺🇸 715 83 287ms 22 Aug 2023 273rd zacjl 715 83 12ms 21 Apr 2025 276th MeWhenI 🇻🇦 713 209 2ms 10 Sep 2022 276th m-tkach 🇺🇦 713 209 2ms 26 Oct 2022 278th dokutan 710 63 2,362ms 26 Mar 2023 279th SirBogman 🇺🇸 709 64 41ms 24 Jan 2024 280th emgordon154 703 81 409ms 3 Jul 2025 281st MeWhenI 🇻🇦 701 142 108ms 15 Oct 2022 282nd emplv 🇱🇻 700 80 130ms 29 Oct 2024 283rd error256 699 100 1,663ms 14 Feb 2025 284th bizy-coder 698 85 13ms 21 days ago 285th duckyluuk 🇳🇱 694 82 454ms 29 Aug 2024 286th albanian-laundromat 694 211 477ms 18 Oct 2025 287th MeWhenI 🇻🇦 692 177 168ms 17 Nov 2022 288th eprovst 🇧🇪 691 60 312ms 16 Sep 2025 289th rucin93 🇵🇱 691 81 129ms 22 Aug 2024 290th lynn 690 86 12ms 2 Jan 2022 290th fkantelberg 690 86 84ms 18 Jul 2025 290th Babafaba 690 86 268ms 23 Oct 2025 293rd Yewzir 🇧🇪 690 216 2ms 18 Jan 2024 294th stefangimmillaro 687 145 116ms 18 Oct 2023 295th Steffan153 🇫🇮 686 567 27ms 27 Feb 2024 296th sisyphus-ppcg 🇦🇺 685 90 1,933ms 13 Jan 2023 297th MeWhenI 🇻🇦 683 569 27ms 7 Jun 2023 298th NewDefectus 🇮🇱 682 87 12ms 5 Jan 2022 298th YAJUE114514 682 87 39ms 6 days ago 300th MeWhenI 🇻🇦 681 239 220ms 5 Feb 2022 300th dokutan 681 239 209ms 1 Jul 2025 302nd MeWhenI 🇻🇦 678 94 356ms 14 Jul 2024 303rd MeWhenI 🇻🇦 675 234 315ms 26 Aug 2023 304th stefangimmillaro 674 88 12ms 30 Dec 2024 305th Kacarott 🇦🇺 672 104 4,341ms 8 days ago 306th lynn 671 579 27ms 23 Jul 2023 307th edsrzf 🇳🇿 667 141 100ms 26 days ago 308th Shanethegamer 🇺🇸 666 96 12ms 26 May 2022 309th annaproxy 663 114 125ms 28 Jan 2022 309th TrueBoxGuy 663 114 322ms 15 Jul 2023 311th Babafaba 662 86 593ms 23 Oct 2025 312th bricknellj 659 90 10ms 6 Mar 2023 312th croc54 659 90 26ms 27 Nov 2024 312th MeWhenI 🇻🇦 659 90 12ms 23 Apr 2025 315th ovs-code 🇩🇪 658 192 2,639ms 25 May 2023 316th stefangimmillaro 658 222 86ms 21 Oct 2025 317th MeWhenI 🇻🇦 656 94 491ms 16 Apr 2023 318th SirBogman 🇺🇸 655 87 416ms 24 Jan 2024 318th Steffan153 🇫🇮 655 87 421ms 19 Feb 2024 320th tayloia 🇬🇧 653 98 19ms 16 May 2023 First Prev 241–320 of 1,670 Next Last