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 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 161st emplv 🇱🇻 859 80 130ms 29 Oct 2024 162nd kg583 🇺🇸 859 111 26ms 26 Mar 2025 163rd sean-niemann 🇺🇸 856 135 437ms 3 Nov 2023 163rd SirBogman 🇺🇸 856 135 415ms 24 Jan 2024 165th jared-hughes 854 76 11ms 20 Jan 2023 166th DialFrost 🇸🇬 852 79 825ms 6 Sep 2025 167th sean-niemann 🇺🇸 852 173 293ms 30 Dec 2024 168th m-tkach 🇺🇦 850 605 3ms 6 Mar 2024 169th rucin93 🇵🇱 848 81 129ms 22 Aug 2024 169th sean-niemann 🇺🇸 848 81 131ms 31 Aug 2024 171st kg583 🇺🇸 847 75 419ms 26 Mar 2024 171st JayXon 🇺🇸 847 75 416ms 25 Nov 2025 173rd nwellnhof 🇩🇪 847 83 639ms 6 Jan 2022 173rd zacjl 847 83 12ms 21 Apr 2025 175th sean-niemann 🇺🇸 846 137 970ms 3 Jul 2025 176th blaztoma 🇱🇹 845 351 128ms 25 days ago 177th SirBogman 🇺🇸 843 51 2,708ms 8 Aug 2023 178th JayXon 🇺🇸 839 64 4,362ms 16 Aug 2024 179th MeWhenI 🇻🇦 838 120 480ms 28 Feb 2022 179th DialFrost 🇸🇬 838 120 541ms 26 Oct 2023 181st AdrienHache 🇫🇷 838 138 396ms 25 Nov 2025 182nd GrayJoKing 🇦🇺 837 84 12ms 2 Jan 2022 183rd JayXon 🇺🇸 837 97 969ms 7 Jan 2022 184th jared-hughes 837 616 7ms 17 Dec 2024 185th emplv 🇱🇻 833 78 12ms 3 Jan 2022 186th Codsilla 🇨🇦 831 55 264ms 3 Jul 2022 187th bizy-coder 827 85 13ms 27 days ago 188th annaproxy 826 140 405ms 5 May 2022 189th Steffan153 🇫🇮 822 79 12ms 1 Nov 2023 189th rucin93 🇵🇱 822 79 12ms 3 Nov 2023 189th sean-niemann 🇺🇸 822 79 11ms 3 Nov 2023 189th vlpx 🇫🇮 822 79 12ms 1 Aug 2024 193rd edsrzf 🇳🇿 821 82 1,534ms 22 Nov 2025 194th stefangimmillaro 820 99 854ms 30 Dec 2024 195th GrayJoKing 🇦🇺 820 112 2,116ms 29 Oct 2023 195th clockworknazo 820 112 905ms 30 Oct 2023 197th jared-hughes 819 136 3,169ms 18 Sep 2024 198th lynn 818 86 12ms 2 Jan 2022 198th annaproxy 818 86 11ms 3 Jan 2022 200th jared-hughes 817 156 14ms 5 Feb 2023 201st emgordon154 814 632 3ms 11 Jul 2024 202nd NewDefectus 🇮🇱 808 87 12ms 5 Jan 2022 202nd Irratix 🇳🇱 808 87 12ms 26 Apr 2022 202nd Steffan153 🇫🇮 808 87 12ms 1 Nov 2023 202nd SirBogman 🇺🇸 808 87 11ms 24 Jan 2024 202nd YAJUE114514 808 87 39ms 11 days ago 207th Shanethegamer 🇺🇸 804 125 495ms 3 Jun 2022 208th namelessiw 803 144 397ms 21 Jul 2025 209th Irratix 🇳🇱 802 81 12ms 4 Mar 2022 209th dmrichwa 🇺🇸 802 81 12ms 31 May 2022 209th lukegustafson 🇺🇸 802 81 82ms 15 Nov 2023 209th stefangimmillaro 802 81 11ms 30 Dec 2024 213th jared-hughes 801 176 93ms 5 Feb 2023 214th DialFrost 🇸🇬 801 185 1,552ms 8 Mar 2025 215th primo-ppcg 🇹🇭 800 155 274ms 16 Jan 2022 216th stefangimmillaro 799 88 12ms 30 Dec 2024 216th sean-niemann 🇺🇸 799 88 12ms 14 Jun 2025 218th KatieLG 🇬🇧 798 645 4ms 11 Oct 2025 219th AlephSquirrel 795 120 1,812ms 11 Mar 2023 220th NewDefectus 🇮🇱 792 82 12ms 5 Jan 2022 221st albanian-laundromat 792 85 927ms 12 Sep 2025 222nd CornerMercury 🇬🇧 790 89 10ms 23 Nov 2025 223rd sean-niemann 🇺🇸 790 124 541ms 27 Aug 2025 224th FlorianCassayre 🇫🇷 788 58 2,246ms 2 Sep 2023 225th MeWhenI 🇻🇦 788 103 848ms 15 Apr 2023 226th dokutan 783 657 3ms 7 Nov 2025 227th 4hg 🇺🇸 782 55 2,707ms 14 Apr 2023 228th Argeento 🇵🇱 782 83 10ms 27 Aug 2023 229th bricknellj 782 90 10ms 6 Mar 2023 229th croc54 782 90 26ms 27 Nov 2024 229th lifthrasiir 🇰🇷 782 90 11ms 7 Dec 2024 229th plcc0 782 90 12ms 24 Mar 2025 229th MeWhenI 🇻🇦 782 90 12ms 23 Apr 2025 234th stefangimmillaro 774 222 462ms 6 Oct 2025 235th hallvabo 🇳🇴 773 91 43ms 5 Mar 2023 236th lyphyser 768 166 564ms 2 Feb 2024 237th MeWhenI 🇻🇦 767 70 45ms 23 Aug 2022 237th jared-hughes 767 70 38ms 20 Jan 2023 237th stefangimmillaro 767 70 63ms 30 Dec 2024 240th tomtheisen 🇺🇸 766 151 432ms 10 Jan 2023 First Prev 161–240 of 1,695 Next Last