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 146th jared-hughes 957 41 9ms 8 Apr 2022 146th rucin93 🇵🇱 957 41 9ms 26 May 2022 146th Steffan153 🇫🇮 957 41 9ms 24 Sep 2022 146th emplv 🇱🇻 957 41 8ms 27 Sep 2022 146th AlephSquirrel 957 41 9ms 7 Jan 2023 146th randolchance 957 41 9ms 19 Jan 2023 146th DialFrost 🇸🇬 957 41 9ms 23 Jan 2023 146th prplz 🇦🇺 957 41 8ms 26 Jan 2023 146th sean-niemann 🇺🇸 957 41 9ms 26 Jan 2023 146th xsot 🇸🇬 957 41 8ms 20 May 2023 146th stefangimmillaro 957 41 8ms 12 Jun 2023 146th Argeento 🇵🇱 957 41 8ms 25 Aug 2023 146th ovs-code 🇩🇪 957 41 8ms 29 Sep 2023 146th lukegustafson 🇺🇸 957 41 9ms 13 Nov 2023 146th helbling 🇨🇭 957 41 9ms 17 May 2024 146th vlpx 🇫🇮 957 41 8ms 18 Jun 2024 146th pardouin 🇫🇷 957 41 9ms 4 Aug 2024 146th emgordon154 957 41 9ms 19 Sep 2024 146th edsrzf 🇳🇿 957 41 9ms 19 Nov 2024 146th fuzzylojik-golf 🇺🇸 957 41 9ms 15 May 2025 146th b-illy 🇬🇧 957 41 9ms 2 Jul 2025 146th Yax42 🇫🇷 957 41 9ms 5 Sep 2025 146th CaedenHarper 🇨🇦 957 41 9ms 30 Oct 2025 146th snoozingnewt 🇨🇦 957 41 9ms 21 Nov 2025 146th Lv0Sys 🇵🇱 957 41 9ms 13 days ago 186th andersk 🇺🇸 952 45 11ms 25 Oct 2022 186th FlorianCassayre 🇫🇷 952 45 9ms 16 Sep 2023 186th Command-Master 952 45 11ms 23 Sep 2023 186th cesarm4 952 45 9ms 29 Nov 2023 186th Natanaelel 🇸🇪 952 45 11ms 3 Jan 2024 186th klixel 🇨🇦 952 45 11ms 18 Nov 2024 192nd Lydxn 🇨🇦 949 32 244ms 29 Jan 2022 192nd btnlq 949 32 240ms 29 Jan 2022 192nd sisyphus-ppcg 🇦🇺 949 32 245ms 2 Feb 2022 195th ovs-code 🇩🇪 942 41 330ms 15 Jan 2024 195th DialFrost 🇸🇬 942 41 329ms 15 Jan 2024 195th GolfingSuccess 🇬🇷 942 41 335ms 15 Jan 2024 195th inventshah 942 41 328ms 15 Jan 2024 195th Lydxn 🇨🇦 942 41 327ms 16 Jan 2024 195th sean-niemann 🇺🇸 942 41 326ms 16 Jan 2024 195th Steffan153 🇫🇮 942 41 338ms 16 Jan 2024 195th JayXon 🇺🇸 942 41 326ms 18 Jan 2024 195th Shanethegamer 🇺🇸 942 41 329ms 18 Jan 2024 195th kg583 🇺🇸 942 41 391ms 19 Jan 2024 195th orthoplex 🇨🇽 942 41 357ms 20 Jan 2024 195th m-tkach 🇺🇦 942 41 353ms 21 Jan 2024 195th xsot 🇸🇬 942 41 318ms 25 Jan 2024 195th lynn 942 41 328ms 17 Feb 2024 195th MeWhenI 🇻🇦 942 41 335ms 24 May 2024 195th duckyluuk 🇳🇱 942 41 350ms 17 Jun 2024 195th pardouin 🇫🇷 942 41 336ms 21 Jun 2024 195th emgordon154 942 41 346ms 20 Sep 2024 195th Mukundan314 942 41 350ms 16 Jun 2025 195th b-illy 🇬🇧 942 41 338ms 2 Jul 2025 195th fuzzylojik-golf 🇺🇸 942 41 378ms 3 Jul 2025 195th CaedenHarper 🇨🇦 942 41 336ms 30 Oct 2025 195th snoozingnewt 🇨🇦 942 41 360ms 21 Nov 2025 195th Babafaba 942 41 348ms 23 days ago 195th CornerMercury 🇬🇧 942 41 422ms 3 days ago 220th Lydxn 🇨🇦 940 40 251ms 29 Jan 2022 220th JayXon 🇺🇸 940 40 305ms 29 Jan 2022 220th HPWiz 🇳🇿 940 40 226ms 30 Jan 2022 220th antimon2 🇯🇵 940 40 661ms 5 Sep 2022 220th Steffan153 🇫🇮 940 40 284ms 19 Mar 2023 220th sisyphus-ppcg 🇦🇺 940 40 248ms 20 Mar 2023 220th ovs-code 🇩🇪 940 40 223ms 11 Apr 2023 220th p-zubieta 940 40 644ms 25 Sep 2023 220th DialFrost 🇸🇬 940 40 215ms 2 Jan 2024 220th sean-niemann 🇺🇸 940 40 310ms 12 Mar 2025 230th GrayJoKing 🇦🇺 936 21 38ms 28 Jul 2022 230th ovs-code 🇩🇪 936 21 36ms 2 Feb 2024 230th xsot 🇸🇬 936 21 55ms 9 Jun 2024 230th pardouin 🇫🇷 936 21 61ms 11 Oct 2024 234th Shanethegamer 🇺🇸 935 22 36ms 29 Jan 2022 234th scpchicken 🇵🇼 935 22 35ms 29 Jan 2022 234th SirBogman 🇺🇸 935 22 34ms 29 Jan 2022 234th NewDefectus 🇮🇱 935 22 34ms 30 Jan 2022 234th yzhs 🇩🇪 935 22 33ms 16 Jun 2022 234th saltysylvi 935 22 34ms 5 Aug 2022 234th DialFrost 🇸🇬 935 22 31ms 30 Nov 2022 First Prev 161–240 of 1,982 Next Last