The Calendar hole will go live in approximately 13 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 480th targrik 896 131 261ms 27 Aug 2025 482nd jhfranklin 🇬🇧 894 23 34ms 11 Feb 2022 483rd GrayJoKing 🇦🇺 894 50 8ms 29 Jan 2022 483rd annaproxy 894 50 13ms 29 Jan 2022 483rd primo-ppcg 🇹🇭 894 50 8ms 30 Jan 2022 483rd Steffan153 🇫🇮 894 50 8ms 24 Sep 2022 483rd IanUtley 894 50 14ms 14 Nov 2023 483rd ovs-code 🇩🇪 894 50 13ms 30 Jun 2024 489th primo-ppcg 🇹🇭 893 34 238ms 29 Jan 2022 489th Shanethegamer 🇺🇸 893 34 268ms 29 Jan 2022 489th Steffan153 🇫🇮 893 34 241ms 19 Dec 2022 489th MeWhenI 🇻🇦 893 34 245ms 28 Jan 2023 489th DialFrost 🇸🇬 893 34 225ms 23 Dec 2023 489th pardouin 🇫🇷 893 34 243ms 22 Sep 2024 489th fuzzylojik-golf 🇺🇸 893 34 245ms 21 Sep 2025 496th clementblaudeau 893 48 9ms 29 Jun 2022 496th shelerr 893 48 9ms 14 Jul 2022 496th anter69 🇭🇺 893 48 9ms 24 Jul 2022 496th idoweinstein 893 48 9ms 4 Aug 2022 496th jakobkordez 🇸🇮 893 48 9ms 6 Nov 2022 496th M0PKOBKA 893 48 9ms 26 Dec 2022 496th Fracture17 893 48 9ms 17 Apr 2023 496th falsidge 893 48 9ms 15 Jun 2023 496th fourth-bit 893 48 9ms 24 Jun 2023 496th adamnielson42 🇺🇸 893 48 9ms 17 Aug 2023 496th mathisfun271 893 48 9ms 22 Dec 2023 496th logvp 893 48 9ms 30 Dec 2023 496th minhtrancccp 893 48 9ms 11 Jan 2024 496th inverseLorentz 🇦🇺 893 48 9ms 1 Apr 2024 496th Yewzir 🇧🇪 893 48 10ms 7 May 2024 496th abcdhhhh 893 48 9ms 25 Aug 2024 496th Languag3 893 48 10ms 3 Mar 2025 496th albanian-laundromat 893 48 10ms 26 Apr 2025 496th swtchblade 893 48 9ms 12 Jul 2025 496th CommandLeo 🇮🇹 893 48 9ms 11 Nov 2025 516th uttumuttu 🇫🇮 892 44 9ms 6 Mar 2022 516th janbehrens 🇩🇪 892 44 9ms 24 Apr 2023 516th two-bad 🇬🇧 892 44 8ms 25 Feb 2024 516th targrik 892 44 9ms 15 Feb 2025 516th alexsave 892 44 9ms 6 Nov 2025 521st MeWhenI 🇻🇦 892 55 1,230ms 8 Jun 2023 521st pardouin 🇫🇷 892 55 1,273ms 23 Apr 2025 521st snoozingnewt 🇨🇦 892 55 1,268ms 15 days ago 524th JayXon 🇺🇸 889 76 3,798ms 8 Nov 2024 524th pardouin 🇫🇷 889 76 4,112ms 30 Nov 2024 526th Lydxn 🇨🇦 889 132 291ms 27 Feb 2023 527th canissimia 🇦🇶 889 222 303ms 24 Mar 2024 528th acotis 887 139 129ms 17 Oct 2025 529th xsot 🇸🇬 887 140 636ms 19 Jun 2025 530th btnlq 886 124 503ms 5 May 2024 531st edsrzf 🇳🇿 885 57 40ms 14 Jan 2025 532nd JayXon 🇺🇸 885 88 147ms 2 Jul 2022 533rd edsrzf 🇳🇿 883 69 97ms 13 days ago 534th KatieLG 🇬🇧 883 82 378ms 12 Oct 2022 534th janbehrens 🇩🇪 883 82 387ms 24 Apr 2023 534th Yewzir 🇧🇪 883 82 374ms 7 May 2024 537th martin-viggiano 882 133 282ms 21 Jun 2022 537th edsrzf 🇳🇿 882 133 294ms 18 Nov 2024 537th fuzzylojik-golf 🇺🇸 882 133 277ms 8 Sep 2025 540th ovs-code 🇩🇪 881 44 70ms 12 Sep 2024 541st MeWhenI 🇻🇦 881 49 123ms 3 Aug 2024 541st ovs-code 🇩🇪 881 49 122ms 3 Aug 2024 541st emgordon154 881 49 127ms 19 Sep 2024 541st fuzzylojik-golf 🇺🇸 881 49 118ms 31 Jul 2025 541st snoozingnewt 🇨🇦 881 49 117ms 15 days ago 546th AdrienHache 🇫🇷 880 88 61ms 24 Nov 2024 547th ovs-code 🇩🇪 879 58 3ms 27 Nov 2022 547th Steffan153 🇫🇮 879 58 3ms 3 Feb 2023 547th GrayJoKing 🇦🇺 879 58 3ms 18 Oct 2023 547th xsot 🇸🇬 879 58 3ms 8 Feb 2024 547th sean-niemann 🇺🇸 879 58 3ms 13 Mar 2025 547th pardouin 🇫🇷 879 58 3ms 13 Mar 2025 553rd neel11235813 878 44 363ms 15 Jan 2024 553rd rucin93 🇵🇱 878 44 335ms 19 Jan 2024 553rd SirBogman 🇺🇸 878 44 346ms 20 Jan 2024 553rd AlephSquirrel 878 44 343ms 21 Jan 2024 553rd dokutan 878 44 345ms 24 Mar 2025 558th Shanethegamer 🇺🇸 878 107 471ms 27 Mar 2025 558th pardouin 🇫🇷 878 107 475ms 28 Mar 2025 558th emgordon154 878 107 434ms 28 Mar 2025 First Prev 481–560 of 1,980 Next Last