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 481st GolfingSuccess 🇬🇷 896 131 260ms 15 Aug 2025 481st targrik 896 131 261ms 27 Aug 2025 483rd jhfranklin 🇬🇧 894 23 34ms 11 Feb 2022 484th GrayJoKing 🇦🇺 894 50 8ms 29 Jan 2022 484th annaproxy 894 50 13ms 29 Jan 2022 484th primo-ppcg 🇹🇭 894 50 8ms 30 Jan 2022 484th Steffan153 🇫🇮 894 50 8ms 24 Sep 2022 484th IanUtley 894 50 14ms 14 Nov 2023 484th ovs-code 🇩🇪 894 50 13ms 30 Jun 2024 490th primo-ppcg 🇹🇭 893 34 238ms 29 Jan 2022 490th Shanethegamer 🇺🇸 893 34 268ms 29 Jan 2022 490th Steffan153 🇫🇮 893 34 241ms 19 Dec 2022 490th MeWhenI 🇻🇦 893 34 245ms 28 Jan 2023 490th DialFrost 🇸🇬 893 34 225ms 23 Dec 2023 490th pardouin 🇫🇷 893 34 243ms 22 Sep 2024 490th fuzzylojik-golf 🇺🇸 893 34 245ms 21 Sep 2025 497th clementblaudeau 893 48 9ms 29 Jun 2022 497th shelerr 893 48 9ms 14 Jul 2022 497th anter69 🇭🇺 893 48 9ms 24 Jul 2022 497th idoweinstein 893 48 9ms 4 Aug 2022 497th jakobkordez 🇸🇮 893 48 9ms 6 Nov 2022 497th M0PKOBKA 893 48 9ms 26 Dec 2022 497th Fracture17 893 48 9ms 17 Apr 2023 497th falsidge 893 48 9ms 15 Jun 2023 497th fourth-bit 893 48 9ms 24 Jun 2023 497th adamnielson42 🇺🇸 893 48 9ms 17 Aug 2023 497th mathisfun271 893 48 9ms 22 Dec 2023 497th logvp 893 48 9ms 30 Dec 2023 497th minhtrancccp 893 48 9ms 11 Jan 2024 497th inverseLorentz 🇦🇺 893 48 9ms 1 Apr 2024 497th Yewzir 🇧🇪 893 48 10ms 7 May 2024 497th abcdhhhh 893 48 9ms 25 Aug 2024 497th Languag3 893 48 10ms 3 Mar 2025 497th albanian-laundromat 893 48 10ms 26 Apr 2025 497th swtchblade 893 48 9ms 12 Jul 2025 497th CommandLeo 🇮🇹 893 48 9ms 11 Nov 2025 517th uttumuttu 🇫🇮 892 44 9ms 6 Mar 2022 517th janbehrens 🇩🇪 892 44 9ms 24 Apr 2023 517th two-bad 🇬🇧 892 44 8ms 25 Feb 2024 517th targrik 892 44 9ms 15 Feb 2025 517th alexsave 892 44 9ms 6 Nov 2025 522nd MeWhenI 🇻🇦 892 55 1,230ms 8 Jun 2023 522nd pardouin 🇫🇷 892 55 1,273ms 23 Apr 2025 522nd snoozingnewt 🇨🇦 892 55 1,268ms 17 days ago 525th JayXon 🇺🇸 889 76 3,798ms 8 Nov 2024 525th pardouin 🇫🇷 889 76 4,112ms 30 Nov 2024 527th Lydxn 🇨🇦 889 132 291ms 27 Feb 2023 528th kumavale 889 135 133ms 15 hours ago 529th canissimia 🇦🇶 889 222 303ms 24 Mar 2024 530th xsot 🇸🇬 887 140 636ms 19 Jun 2025 531st btnlq 886 124 503ms 5 May 2024 532nd edsrzf 🇳🇿 885 57 40ms 14 Jan 2025 533rd JayXon 🇺🇸 885 88 147ms 2 Jul 2022 534th edsrzf 🇳🇿 883 69 97ms 15 days ago 535th KatieLG 🇬🇧 883 82 378ms 12 Oct 2022 535th janbehrens 🇩🇪 883 82 387ms 24 Apr 2023 535th Yewzir 🇧🇪 883 82 374ms 7 May 2024 538th martin-viggiano 882 133 282ms 21 Jun 2022 538th edsrzf 🇳🇿 882 133 294ms 18 Nov 2024 538th fuzzylojik-golf 🇺🇸 882 133 277ms 8 Sep 2025 541st ovs-code 🇩🇪 881 44 70ms 12 Sep 2024 542nd MeWhenI 🇻🇦 881 49 123ms 3 Aug 2024 542nd ovs-code 🇩🇪 881 49 122ms 3 Aug 2024 542nd emgordon154 881 49 127ms 19 Sep 2024 542nd fuzzylojik-golf 🇺🇸 881 49 118ms 31 Jul 2025 542nd snoozingnewt 🇨🇦 881 49 117ms 17 days ago 547th AdrienHache 🇫🇷 880 88 61ms 24 Nov 2024 548th ovs-code 🇩🇪 879 58 3ms 27 Nov 2022 548th Steffan153 🇫🇮 879 58 3ms 3 Feb 2023 548th GrayJoKing 🇦🇺 879 58 3ms 18 Oct 2023 548th xsot 🇸🇬 879 58 3ms 8 Feb 2024 548th sean-niemann 🇺🇸 879 58 3ms 13 Mar 2025 548th pardouin 🇫🇷 879 58 3ms 13 Mar 2025 554th neel11235813 878 44 363ms 15 Jan 2024 554th rucin93 🇵🇱 878 44 335ms 19 Jan 2024 554th SirBogman 🇺🇸 878 44 346ms 20 Jan 2024 554th AlephSquirrel 878 44 343ms 21 Jan 2024 554th dokutan 878 44 345ms 24 Mar 2025 559th Shanethegamer 🇺🇸 878 107 471ms 27 Mar 2025 559th pardouin 🇫🇷 878 107 475ms 28 Mar 2025 First Prev 481–560 of 1,982 Next Last