The Calendar hole will go live in approximately 11 days. Why not try and solve it ahead of time?
Catalan Numbers 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 313th dokutan 912 43 9ms 22 Sep 2025 322nd RYNO8 912 47 11ms 18 Feb 2022 322nd TFeld00 🇩🇰 912 47 9ms 22 Apr 2022 322nd LukasFolwarczny 🇨🇿 912 47 11ms 16 Sep 2022 322nd commandblockguy 🇺🇸 912 47 9ms 18 Sep 2022 322nd KatieLG 🇬🇧 912 47 11ms 6 Oct 2022 322nd betaveros 912 47 11ms 30 Dec 2022 322nd Just4FunCoder 912 47 11ms 23 Mar 2023 322nd vishwathg 912 47 11ms 4 Apr 2023 322nd Schreipfelerer 912 47 11ms 9 Apr 2023 322nd quimey 912 47 10ms 23 Jun 2023 322nd dranjohn 912 47 9ms 16 Sep 2023 322nd keelimeguy 🇺🇸 912 47 11ms 16 Dec 2023 322nd bob-th 912 47 11ms 22 Jan 2024 322nd fgrosshans 🇫🇷 912 47 11ms 16 Jul 2024 322nd moustave 912 47 10ms 4 Dec 2024 322nd Bulmenisaurus 912 47 13ms 6 Feb 2025 322nd xiaoyiming123 912 47 9ms 23 Jul 2025 322nd InigoK 🇺🇸 912 47 9ms 9 Aug 2025 322nd luuumine 🇫🇷 912 47 13ms 21 Nov 2025 322nd Lv0Sys 🇵🇱 912 47 9ms 13 days ago 342nd fuzzylojik-golf 🇺🇸 912 119 419ms 24 Sep 2025 342nd sean-niemann 🇺🇸 912 119 454ms 24 Sep 2025 342nd JayXon 🇺🇸 912 119 394ms 25 Sep 2025 342nd nwellnhof 🇩🇪 912 119 397ms 25 Sep 2025 346th clockworknazo 911 56 5ms 30 Sep 2022 346th Lydxn 🇨🇦 911 56 5ms 28 Feb 2023 348th Lydxn 🇨🇦 911 58 5ms 29 Jan 2022 348th primo-ppcg 🇹🇭 911 58 6ms 29 Jan 2022 348th AlephSquirrel 911 58 5ms 16 Jan 2023 348th ovs-code 🇩🇪 911 58 5ms 11 Mar 2023 348th varhammer 🇷🇺 911 58 5ms 19 Oct 2024 348th kg583 🇺🇸 911 58 5ms 21 Oct 2024 348th CLOStrophobic 🇮🇹 911 58 6ms 17 Jan 2025 348th zacjl 911 58 5ms 21 Jan 2025 348th edsrzf 🇳🇿 911 58 6ms 12 days ago 357th error256 909 56 5ms 26 Oct 2024 357th zacjl 909 56 5ms 29 Oct 2024 357th edsrzf 🇳🇿 909 56 5ms 14 Jan 2025 360th Lydxn 🇨🇦 908 54 1,247ms 29 Jan 2022 360th lynn 908 54 1,277ms 29 Jan 2022 360th JayXon 🇺🇸 908 54 1,258ms 29 Jan 2022 360th primo-ppcg 🇹🇭 908 54 1,270ms 29 Jan 2022 360th Steffan153 🇫🇮 908 54 1,280ms 4 Jan 2023 360th Shanethegamer 🇺🇸 908 54 1,257ms 21 Feb 2023 360th DialFrost 🇸🇬 908 54 1,297ms 10 Mar 2025 360th sean-niemann 🇺🇸 908 54 1,269ms 18 Apr 2025 360th edsrzf 🇳🇿 908 54 1,284ms 31 Aug 2025 369th primo-ppcg 🇹🇭 905 80 382ms 29 Jan 2022 369th m-tkach 🇺🇦 905 80 391ms 31 Jan 2022 369th Steffan153 🇫🇮 905 80 373ms 24 Sep 2022 369th tomtheisen 🇺🇸 905 80 391ms 7 Feb 2023 369th stefangimmillaro 905 80 384ms 7 Jul 2023 369th namelessiw 905 80 390ms 5 Jun 2025 369th DialFrost 🇸🇬 905 80 381ms 8 Sep 2025 369th CaedenHarper 🇨🇦 905 80 386ms 30 Oct 2025 369th snoozingnewt 🇨🇦 905 80 352ms 17 days ago 378th stefangimmillaro 904 120 574ms 6 Oct 2025 378th CaedenHarper 🇨🇦 904 120 432ms 10 Oct 2025 378th MeWhenI 🇻🇦 904 120 425ms 7 Nov 2025 381st GrayJoKing 🇦🇺 903 45 74ms 8 Jun 2022 381st Lydxn 🇨🇦 903 45 72ms 8 Jun 2022 381st pardouin 🇫🇷 903 45 69ms 3 Sep 2024 384th JayXon 🇺🇸 903 70 96ms 14 Oct 2022 384th Lydxn 🇨🇦 903 70 98ms 15 Oct 2022 386th JayXon 🇺🇸 903 130 281ms 8 Feb 2022 386th nwellnhof 🇩🇪 903 130 296ms 3 Jun 2022 386th kkoenig 903 130 271ms 6 Sep 2025 389th annaproxy 902 34 42ms 29 Jan 2022 389th shinh 902 34 37ms 27 Jun 2022 389th anter69 🇭🇺 902 34 40ms 24 Jul 2022 389th janlelis 902 34 39ms 28 Aug 2022 393rd Lydxn 🇨🇦 902 69 474ms 14 Jul 2023 393rd JayXon 🇺🇸 902 69 500ms 14 Jul 2023 393rd fuzzylojik-golf 🇺🇸 902 69 467ms 20 Sep 2025 393rd sean-niemann 🇺🇸 902 69 492ms 21 Sep 2025 397th GrayJoKing 🇦🇺 901 43 72ms 10 days ago 398th kg583 🇺🇸 901 56 38ms 4 Apr 2025 398th zacjl 901 56 39ms 16 May 2025 400th JayXon 🇺🇸 901 122 551ms 5 May 2024 First Prev 321–400 of 1,968 Next Last