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 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 lifthrasiir 🇰🇷 934 42 9ms 23 Nov 2024 250th lynn 934 49 124ms 29 Jan 2022 250th Lydxn 🇨🇦 934 49 129ms 29 Jan 2022 250th JayXon 🇺🇸 934 49 126ms 29 Jan 2022 250th annaproxy 934 49 123ms 29 Jan 2022 250th rak1507 🇬🇧 934 49 124ms 29 Jan 2022 250th HPWiz 🇳🇿 934 49 124ms 29 Jan 2022 250th xnor-gate 934 49 127ms 30 Jan 2022 250th arjanadriaanse 🇳🇱 934 49 123ms 9 Feb 2022 250th ovs-code 🇩🇪 934 49 125ms 6 Mar 2022 250th GrayJoKing 🇦🇺 934 49 124ms 10 Mar 2022 250th Sakisan 🇧🇪 934 49 126ms 7 Apr 2022 250th Steffan153 🇫🇮 934 49 127ms 24 Sep 2022 250th btnlq 934 49 125ms 17 Oct 2023 250th Natanaelel 🇸🇪 934 49 124ms 3 Jan 2024 250th DialFrost 🇸🇬 934 49 120ms 5 Aug 2024 250th pardouin 🇫🇷 934 49 122ms 8 Oct 2024 250th error256 934 49 128ms 26 Oct 2024 250th sean-niemann 🇺🇸 934 49 134ms 30 Dec 2024 250th fuzzylojik-golf 🇺🇸 934 49 121ms 14 Sep 2025 269th sisyphus-ppcg 🇦🇺 931 42 28ms 22 May 2022 269th Lydxn 🇨🇦 931 42 28ms 22 May 2022 269th primo-ppcg 🇹🇭 931 42 28ms 23 May 2022 269th iakolzin 931 42 27ms 28 May 2022 269th saito-ta 🇯🇵 931 42 27ms 8 Jun 2022 269th nwellnhof 🇩🇪 931 42 28ms 8 Jun 2022 269th fuzzylojik-golf 🇺🇸 931 42 28ms 20 Sep 2025 276th btjones0 931 46 9ms 6 Feb 2022 276th SirBogman 🇺🇸 931 46 9ms 10 May 2022 276th 051 🇸🇬 931 46 9ms 19 Aug 2022 276th AlephSquirrel 931 46 10ms 7 Jan 2023 276th thehylian 931 46 9ms 11 Jan 2023 276th zacjl 931 46 9ms 20 Apr 2023 276th janbehrens 🇩🇪 931 46 9ms 24 Apr 2023 276th crispshaker 931 46 9ms 19 Jun 2023 276th ndren 931 46 10ms 5 Aug 2023 276th wen1now 931 46 9ms 6 Nov 2023 276th rucin93 🇵🇱 931 46 9ms 6 Dec 2023 276th ballaire 931 46 10ms 27 Jan 2024 276th wuzekai518 931 46 9ms 21 Jun 2024 276th ahmetdemirag 🇨🇾 931 46 9ms 30 Jun 2024 276th FranklinJiaChen 931 46 9ms 3 Jul 2024 276th codingisgreatbutiamnot 931 46 9ms 25 Jul 2024 276th martion2007 931 46 9ms 14 Aug 2024 276th bizy-coder 931 46 10ms 16 Aug 2024 276th bzijlema 🇳🇱 931 46 9ms 14 Oct 2024 276th dokutan 931 46 9ms 18 Mar 2025 276th plcc0 931 46 9ms 27 Apr 2025 276th KasperKivimaeki 🇫🇮 931 46 9ms 29 Jun 2025 276th dirckvdende 931 46 9ms 24 Jul 2025 276th qpwoeirut 931 46 9ms 13 Aug 2025 276th solisolu 931 46 9ms 1 Oct 2025 276th michaelmgreer 931 46 9ms 14 Oct 2025 302nd akshatj27 🇦🇶 929 33 36ms 29 Jan 2022 302nd Waffle3z 929 33 36ms 29 Jan 2022 302nd ovs-code 🇩🇪 929 33 38ms 29 Jan 2022 302nd rak1507 🇬🇧 929 33 38ms 29 Jan 2022 302nd Shanethegamer 🇺🇸 929 33 42ms 29 Jan 2022 302nd jared-hughes 929 33 39ms 12 Sep 2022 302nd ritwin-n 929 33 46ms 11 Jun 2023 302nd Natanaelel 🇸🇪 929 33 51ms 3 Jan 2024 302nd jipsong 🇩🇪 929 33 36ms 30 Jun 2024 311th GrayJoKing 🇦🇺 925 26 120ms 29 Jan 2022 311th primo-ppcg 🇹🇭 925 26 104ms 29 Jan 2022 311th Natanaelel 🇸🇪 925 26 152ms 3 Jan 2024 314th MeWhenI 🇻🇦 923 34 4ms 15 Jul 2022 315th primo-ppcg 🇹🇭 923 42 62ms 5 Apr 2025 315th Kacarott 🇦🇺 923 42 62ms 10 days ago 315th error256 923 42 63ms 9 days ago 318th edsrzf 🇳🇿 923 44 73ms 15 Jan 2025 318th JayXon 🇺🇸 923 44 73ms 15 Jan 2025 320th prplz 🇦🇺 921 33 256ms 31 Jan 2022 First Prev 241–320 of 1,982 Next Last