The Calendar hole will go live in approximately 10 days. Why not try and solve it ahead of time?
Catalan Numbers 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 234th MeWhenI 🇻🇦 935 22 33ms 30 Nov 2022 234th sean-niemann 🇺🇸 935 22 34ms 4 Jan 2023 234th Betuaredead 935 22 32ms 21 Jan 2023 234th Steffan153 🇫🇮 935 22 36ms 28 Jan 2023 234th ashtraypettingzoo 🇺🇸 935 22 34ms 23 Feb 2023 234th Yewzir 🇧🇪 935 22 32ms 6 Nov 2023 234th jitwit 935 22 32ms 10 May 2025 234th eprovst 🇧🇪 935 22 34ms 16 Sep 2025 249th lynn 935 49 124ms 29 Jan 2022 249th Lydxn 🇨🇦 935 49 129ms 29 Jan 2022 249th JayXon 🇺🇸 935 49 126ms 29 Jan 2022 249th annaproxy 935 49 123ms 29 Jan 2022 249th rak1507 🇬🇧 935 49 124ms 29 Jan 2022 249th HPWiz 🇳🇿 935 49 124ms 29 Jan 2022 249th xnor-gate 935 49 127ms 30 Jan 2022 249th arjanadriaanse 🇳🇱 935 49 123ms 9 Feb 2022 249th ovs-code 🇩🇪 935 49 125ms 6 Mar 2022 249th GrayJoKing 🇦🇺 935 49 124ms 10 Mar 2022 249th Sakisan 🇧🇪 935 49 126ms 7 Apr 2022 249th Steffan153 🇫🇮 935 49 127ms 24 Sep 2022 249th btnlq 935 49 125ms 17 Oct 2023 249th Natanaelel 🇸🇪 935 49 124ms 3 Jan 2024 249th DialFrost 🇸🇬 935 49 120ms 5 Aug 2024 249th pardouin 🇫🇷 935 49 122ms 8 Oct 2024 249th error256 935 49 128ms 26 Oct 2024 249th sean-niemann 🇺🇸 935 49 134ms 30 Dec 2024 249th fuzzylojik-golf 🇺🇸 935 49 121ms 14 Sep 2025 249th edsrzf 🇳🇿 935 49 162ms 5 hours ago 269th lifthrasiir 🇰🇷 934 42 9ms 23 Nov 2024 270th sisyphus-ppcg 🇦🇺 931 42 28ms 22 May 2022 270th Lydxn 🇨🇦 931 42 28ms 22 May 2022 270th primo-ppcg 🇹🇭 931 42 28ms 23 May 2022 270th iakolzin 931 42 27ms 28 May 2022 270th saito-ta 🇯🇵 931 42 27ms 8 Jun 2022 270th nwellnhof 🇩🇪 931 42 28ms 8 Jun 2022 270th fuzzylojik-golf 🇺🇸 931 42 28ms 20 Sep 2025 277th btjones0 931 46 9ms 6 Feb 2022 277th SirBogman 🇺🇸 931 46 9ms 10 May 2022 277th 051 🇸🇬 931 46 9ms 19 Aug 2022 277th AlephSquirrel 931 46 10ms 7 Jan 2023 277th thehylian 931 46 9ms 11 Jan 2023 277th zacjl 931 46 9ms 20 Apr 2023 277th janbehrens 🇩🇪 931 46 9ms 24 Apr 2023 277th crispshaker 931 46 9ms 19 Jun 2023 277th ndren 931 46 10ms 5 Aug 2023 277th wen1now 931 46 9ms 6 Nov 2023 277th rucin93 🇵🇱 931 46 9ms 6 Dec 2023 277th ballaire 931 46 10ms 27 Jan 2024 277th wuzekai518 931 46 9ms 21 Jun 2024 277th ahmetdemirag 🇨🇾 931 46 9ms 30 Jun 2024 277th FranklinJiaChen 931 46 9ms 3 Jul 2024 277th codingisgreatbutiamnot 931 46 9ms 25 Jul 2024 277th martion2007 931 46 9ms 14 Aug 2024 277th bizy-coder 931 46 10ms 16 Aug 2024 277th bzijlema 🇳🇱 931 46 9ms 14 Oct 2024 277th dokutan 931 46 9ms 18 Mar 2025 277th plcc0 931 46 9ms 27 Apr 2025 277th KasperKivimaeki 🇫🇮 931 46 9ms 29 Jun 2025 277th dirckvdende 931 46 9ms 24 Jul 2025 277th qpwoeirut 931 46 9ms 13 Aug 2025 277th solisolu 931 46 9ms 1 Oct 2025 277th michaelmgreer 931 46 9ms 14 Oct 2025 303rd akshatj27 🇦🇶 929 33 36ms 29 Jan 2022 303rd Waffle3z 929 33 36ms 29 Jan 2022 303rd ovs-code 🇩🇪 929 33 38ms 29 Jan 2022 303rd rak1507 🇬🇧 929 33 38ms 29 Jan 2022 303rd Shanethegamer 🇺🇸 929 33 42ms 29 Jan 2022 303rd jared-hughes 929 33 39ms 12 Sep 2022 303rd ritwin-n 929 33 46ms 11 Jun 2023 303rd Natanaelel 🇸🇪 929 33 51ms 3 Jan 2024 303rd jipsong 🇩🇪 929 33 36ms 30 Jun 2024 312th GrayJoKing 🇦🇺 925 26 120ms 29 Jan 2022 312th primo-ppcg 🇹🇭 925 26 104ms 29 Jan 2022 312th Natanaelel 🇸🇪 925 26 152ms 3 Jan 2024 315th MeWhenI 🇻🇦 923 34 4ms 15 Jul 2022 316th primo-ppcg 🇹🇭 923 42 62ms 5 Apr 2025 316th Kacarott 🇦🇺 923 42 62ms 11 days ago 316th error256 923 42 63ms 10 days ago 319th edsrzf 🇳🇿 923 44 73ms 15 Jan 2025 319th JayXon 🇺🇸 923 44 73ms 15 Jan 2025 First Prev 241–320 of 1,983 Next Last