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 chars. 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 Chars Time Submitted 401st HPWiz 🇳🇿 901 127 4ms 4 May 2025 402nd rucin93 🇵🇱 900 47 129ms 3 Aug 2024 403rd Shanethegamer 🇺🇸 900 55 841ms 29 Jan 2022 403rd GrayJoKing 🇦🇺 900 55 974ms 17 Oct 2023 403rd jipsong 🇩🇪 900 55 856ms 30 Jun 2024 406th ovs-code 🇩🇪 898 41 330ms 15 Jan 2024 406th DialFrost 🇸🇬 898 41 329ms 15 Jan 2024 406th GolfingSuccess 🇬🇷 898 41 335ms 15 Jan 2024 406th inventshah 898 41 328ms 15 Jan 2024 406th JayXon 🇺🇸 898 41 326ms 18 Jan 2024 406th Shanethegamer 🇺🇸 898 41 329ms 18 Jan 2024 406th kg583 🇺🇸 898 41 391ms 19 Jan 2024 406th orthoplex 🇨🇽 898 41 357ms 20 Jan 2024 406th m-tkach 🇺🇦 898 41 353ms 21 Jan 2024 406th xsot 🇸🇬 898 41 318ms 25 Jan 2024 406th lynn 898 41 328ms 17 Feb 2024 406th MeWhenI 🇻🇦 898 41 335ms 24 May 2024 406th duckyluuk 🇳🇱 898 41 350ms 17 Jun 2024 406th pardouin 🇫🇷 898 41 336ms 21 Jun 2024 406th emgordon154 898 41 346ms 20 Sep 2024 406th Mukundan314 898 41 350ms 16 Jun 2025 406th b-illy 🇬🇧 898 41 338ms 2 Jul 2025 406th fuzzylojik-golf 🇺🇸 898 41 340ms 3 Jul 2025 406th CaedenHarper 🇨🇦 898 41 336ms 30 Oct 2025 406th snoozingnewt 🇨🇦 898 41 360ms 26 days ago 406th Babafaba 898 41 348ms 21 days ago 406th CornerMercury 🇬🇧 898 41 422ms 26 hours ago 428th primo-ppcg 🇹🇭 898 51 119ms 29 Jan 2022 428th the-zammers 898 51 121ms 18 Jan 2024 428th MeWhenI 🇻🇦 898 51 119ms 22 Mar 2024 428th tobeannouncd 898 51 138ms 9 Aug 2024 428th jipsong 🇩🇪 898 51 119ms 11 Feb 2025 428th snoozingnewt 🇨🇦 898 51 118ms 15 days ago 434th edsrzf 🇳🇿 897 39 660ms 30 Aug 2025 434th DialFrost 🇸🇬 897 39 763ms 2 Sep 2025 434th CaedenHarper 🇨🇦 897 39 648ms 30 Oct 2025 434th xsot 🇸🇬 897 39 692ms 16 Nov 2025 434th pardouin 🇫🇷 897 39 693ms 17 days ago 439th GrayJoKing 🇦🇺 896 35 4ms 31 Jan 2022 440th primo-ppcg 🇹🇭 896 41 426ms 29 Jan 2022 440th Shanethegamer 🇺🇸 896 41 597ms 20 Feb 2023 440th tidalDisruptionEvent 🇨🇦 896 41 440ms 20 Mar 2023 440th alemelis 896 41 318ms 12 Apr 2023 440th Yewzir 🇧🇪 896 41 405ms 14 Feb 2024 440th BREMAUCY 🇫🇷 896 41 486ms 22 Apr 2024 440th snoozingnewt 🇨🇦 896 41 583ms 15 days ago 447th ovs-code 🇩🇪 896 45 1,590ms 30 Nov 2022 447th HPWiz 🇳🇿 896 45 24ms 2 Feb 2023 449th GolfingSuccess 🇬🇷 896 131 260ms 15 Aug 2025 449th targrik 896 131 261ms 27 Aug 2025 451st GolfingSuccess 🇬🇷 894 20 50ms 22 Jul 2022 451st lynn 894 20 38ms 22 Jul 2022 451st canissimia 🇦🇶 894 20 57ms 22 Jul 2022 451st saito-ta 🇯🇵 894 20 37ms 12 Aug 2022 451st clockworknazo 894 20 57ms 12 Aug 2022 451st primo-ppcg 🇹🇭 894 20 36ms 1 Oct 2022 451st JayXon 🇺🇸 894 20 37ms 9 Oct 2022 451st betaveros 894 20 55ms 4 Jan 2023 451st Steffan153 🇫🇮 894 20 37ms 11 Mar 2023 451st sean-niemann 🇺🇸 894 20 57ms 30 Dec 2024 451st fuzzylojik-golf 🇺🇸 894 20 36ms 6 Aug 2025 451st emgordon154 894 20 44ms 7 Nov 2025 463rd jhfranklin 🇬🇧 894 23 34ms 11 Feb 2022 464th GrayJoKing 🇦🇺 894 50 8ms 29 Jan 2022 464th annaproxy 894 50 13ms 29 Jan 2022 464th primo-ppcg 🇹🇭 894 50 8ms 30 Jan 2022 464th Steffan153 🇫🇮 894 50 8ms 24 Sep 2022 464th IanUtley 894 50 14ms 14 Nov 2023 464th ovs-code 🇩🇪 894 50 13ms 30 Jun 2024 470th primo-ppcg 🇹🇭 893 34 238ms 29 Jan 2022 470th Shanethegamer 🇺🇸 893 34 268ms 29 Jan 2022 470th Steffan153 🇫🇮 893 34 241ms 19 Dec 2022 470th MeWhenI 🇻🇦 893 34 245ms 28 Jan 2023 470th DialFrost 🇸🇬 893 34 225ms 23 Dec 2023 470th pardouin 🇫🇷 893 34 243ms 22 Sep 2024 470th fuzzylojik-golf 🇺🇸 893 34 245ms 21 Sep 2025 477th clementblaudeau 893 48 9ms 29 Jun 2022 477th shelerr 893 48 9ms 14 Jul 2022 477th anter69 🇭🇺 893 48 9ms 24 Jul 2022 477th idoweinstein 893 48 9ms 4 Aug 2022 First Prev 401–480 of 1,964 Next Last