The Calendar hole will go live in approximately 7 days. Why not try and solve it ahead of time?
Catalan’s Constant in all languages in bytes. 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 Bytes Time Submitted 241st tomtheisen 🇺🇸 766 151 432ms 10 Jan 2023 242nd lyphyser 766 184 826ms 2 Feb 2024 243rd ovs-code 🇩🇪 766 234 1,753ms 14 Sep 2025 244th DialFrost 🇸🇬 765 92 14ms 2 Oct 2023 245th primo-ppcg 🇹🇭 764 79 58ms 30 Jan 2022 246th DialFrost 🇸🇬 764 85 12ms 27 Aug 2023 247th MeWhenI 🇻🇦 761 226 460ms 7 Nov 2025 248th Shanethegamer 🇺🇸 759 107 955ms 26 May 2022 249th GrayJoKing 🇦🇺 756 84 378ms 16 Jan 2024 250th Shanethegamer 🇺🇸 756 93 11ms 3 Jun 2022 250th Herbert00709 🇵🇱 756 93 29ms 8 May 2024 250th Fvirgilio 756 93 10ms 10 May 2025 250th FortuiteMan 🇫🇷 756 93 104ms 26 Sep 2025 254th saito-ta 🇯🇵 754 57 60ms 19 Aug 2022 255th Steffan153 🇫🇮 748 135 105ms 18 Feb 2024 256th bitsandbeyond 🇳🇱 747 87 282ms 5 Nov 2025 257th MeWhenI 🇻🇦 747 92 139ms 3 Aug 2024 258th MeWhenI 🇻🇦 746 87 12ms 2 Jan 2022 258th didion0 🇺🇸 746 87 11ms 25 Jan 2022 260th edsrzf 🇳🇿 745 112 84ms 22 Nov 2025 261st CLOStrophobic 🇮🇹 745 128 2,017ms 22 Feb 2025 262nd acotis 745 248 221ms 31 Oct 2025 263rd emplv 🇱🇻 743 136 105ms 7 Dec 2022 264th primo-ppcg 🇹🇭 741 58 36ms 14 Jan 2022 265th lynn 740 104 254ms 14 Apr 2023 266th SirBogman 🇺🇸 739 88 271ms 3 Feb 2024 266th DialFrost 🇸🇬 739 88 343ms 7 Jun 2024 268th inventshah 733 96 56ms 20 Dec 2022 268th albanian-laundromat 733 96 20ms 12 Jul 2025 270th SirBogman 🇺🇸 730 87 416ms 24 Jan 2024 270th Steffan153 🇫🇮 730 87 421ms 19 Feb 2024 272nd MeWhenI 🇻🇦 730 706 9ms 28 Nov 2023 273rd dokutan 726 63 1,965ms 26 Mar 2023 274th SirBogman 🇺🇸 725 74 41ms 24 Jan 2024 275th sisyphus-ppcg 🇦🇺 725 97 57ms 13 Jan 2023 275th scpchicken 🇵🇼 725 97 11ms 28 Feb 2023 277th GrayJoKing 🇦🇺 725 100 77ms 26 May 2022 278th sean-niemann 🇺🇸 725 237 458ms 24 Sep 2025 279th sean-niemann 🇺🇸 721 88 387ms 2 Jul 2025 280th nstearns96 🇬🇧 718 98 12ms 21 Jan 2023 281st eprovst 🇧🇪 717 60 312ms 16 Sep 2025 282nd Yewzir 🇧🇪 715 688 5ms 19 Dec 2024 283rd error256 714 100 1,663ms 14 Feb 2025 284th lifthrasiir 🇰🇷 713 89 407ms 7 Dec 2024 285th MeWhenI 🇻🇦 712 142 108ms 15 Oct 2022 286th adamnielson42 🇺🇸 710 99 18ms 24 Aug 2023 287th albanian-laundromat 702 211 460ms 18 Oct 2025 288th sisyphus-ppcg 🇦🇺 701 90 1,933ms 13 Jan 2023 289th MeWhenI 🇻🇦 701 177 168ms 17 Nov 2022 290th DialFrost 🇸🇬 698 91 386ms 22 Jan 2024 291st stefangimmillaro 697 145 116ms 18 Oct 2023 292nd btjones0 696 101 85ms 19 Jan 2022 293rd MeWhenI 🇻🇦 694 62 65ms 29 Jul 2022 294th MeWhenI 🇻🇦 692 94 356ms 14 Jul 2024 295th MeWhenI 🇻🇦 690 92 396ms 17 Jan 2024 296th Kacarott 🇦🇺 687 104 4,341ms 15 days ago 297th edsrzf 🇳🇿 685 134 94ms 22 Nov 2025 298th Shanethegamer 🇺🇸 683 93 424ms 16 Jan 2024 299th ndren 683 103 28ms 28 Mar 2024 300th MeWhenI 🇻🇦 681 234 315ms 26 Aug 2023 301st DialFrost 🇸🇬 679 79 191ms 1 Jun 2024 302nd edsrzf 🇳🇿 677 141 100ms 22 Nov 2025 303rd ryyyn 🇺🇸 676 104 31ms 16 Nov 2025 304th annaproxy 675 114 125ms 28 Jan 2022 304th TrueBoxGuy 675 114 322ms 15 Jul 2023 306th MeWhenI 🇻🇦 674 884 3ms 25 May 2022 307th AlephSquirrel 672 64 64ms 15 Jan 2023 308th CatsAreFluffy 672 130 283ms 1 Feb 2024 309th Shanethegamer 🇺🇸 671 80 40ms 28 May 2022 309th annaproxy 671 80 41ms 27 Aug 2022 311th MeWhenI 🇻🇦 671 94 491ms 16 Apr 2023 312th ovs-code 🇩🇪 664 192 2,639ms 25 May 2023 313th tayloia 🇬🇧 663 98 19ms 16 May 2023 314th Bubbler-4 662 65 44ms 4 Jan 2022 315th MeWhenI 🇻🇦 662 126 45ms 14 Feb 2025 316th mathisfun271 657 107 23ms 3 Feb 2024 317th MeWhenI 🇻🇦 656 140 843ms 28 Jun 2023 318th ovs-code 🇩🇪 655 215 2,482ms 3 Jun 2024 319th msbranicky 653 70 237ms 12 Jan 2024 320th guilhem-roy 🇫🇷 651 108 54ms 3 Mar 2022 First Prev 241–320 of 1,696 Next Last