The Calendar hole will go live in approximately 11 days. Why not try and solve it ahead of time?
Catalan Numbers in Python 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 241st CedricGebistorf 710 62 9ms 6 Feb 2022 241st Indivicivet 710 62 10ms 9 May 2022 241st MaxElf999 710 62 10ms 24 May 2022 241st rowboat1 710 62 9ms 18 Jun 2022 241st jfallon1997 710 62 9ms 8 Aug 2022 241st NerdyMcNerd42 710 62 10ms 13 Aug 2022 241st Ripick 710 62 9ms 23 Aug 2022 241st EyalLitvin 710 62 9ms 18 Nov 2022 241st Omega65536 🇩🇪 710 62 10ms 24 Nov 2022 241st badboj40 710 62 28ms 27 Dec 2022 241st b10011 🇫🇮 710 62 10ms 8 Jan 2023 241st MichalMarsalek 🇨🇿 710 62 9ms 14 Jan 2023 241st eiburns 710 62 9ms 22 Jan 2023 241st celiendonze 🇨🇭 710 62 9ms 8 Apr 2023 241st Vaekor 710 62 10ms 9 Jul 2023 241st SB-945 710 62 9ms 10 Jul 2023 241st estomagordo 🇳🇱 710 62 10ms 31 Aug 2023 241st rollershutter 710 62 9ms 23 Oct 2023 241st azure-blondon 710 62 10ms 14 Dec 2023 241st chartung17 710 62 9ms 17 Dec 2023 241st mikehanus 710 62 9ms 29 Jan 2024 241st jbjd 710 62 9ms 25 Feb 2024 241st ThijsLuttikhuis 710 62 9ms 1 Mar 2024 241st KingSkyrock 🇺🇸 710 62 10ms 26 Mar 2024 241st 77Tigers 710 62 9ms 9 Apr 2024 241st kejcao 🇨🇦 710 62 10ms 16 May 2024 241st CutSandstone 710 62 9ms 4 Jul 2024 241st jiaminglimjm 🇲🇾 710 62 9ms 5 Jul 2024 241st Mathrew2012 710 62 9ms 30 Aug 2024 241st JunkIce 710 62 11ms 25 Sep 2024 241st croc54 710 62 10ms 21 Dec 2024 241st Rampoina 710 62 10ms 24 May 2025 241st Flekay 🇩🇪 710 62 10ms 10 Jul 2025 241st ValentinCassayre 710 62 10ms 22 Sep 2025 241st Voltrifrodec 🇸🇰 710 62 10ms 18 Nov 2025 276th Jasper-Ty 🇵🇭 698 63 9ms 19 Jun 2022 276th jamespeilunli 698 63 9ms 4 Jul 2022 276th Starwort 🇬🇧 698 63 9ms 11 Nov 2022 276th thomasklunker 698 63 9ms 3 Feb 2023 276th VV1Git 698 63 9ms 19 Apr 2023 276th lucasalavapena 698 63 10ms 11 Dec 2023 276th Techdude01 698 63 9ms 22 Dec 2023 276th AtengChen 698 63 9ms 7 Sep 2024 276th LostSyntax21 🇬🇧 698 63 9ms 20 Sep 2024 276th allen-brandon 698 63 9ms 30 Jul 2025 286th argusdusty 🇺🇸 688 64 13ms 21 Aug 2022 286th BraedenMooreDev 688 64 9ms 29 Oct 2023 286th PrathamMehta08 688 64 14ms 6 Dec 2023 289th wh3n3v3r 🇨🇿 677 65 10ms 12 Nov 2024 290th Drew-j-Smith 657 67 63ms 2 May 2022 290th Shiran-Yuan 657 67 9ms 5 Apr 2023 290th Pale-Vessel 657 67 10ms 1 Apr 2024 290th JKfromHMS 657 67 9ms 20 May 2024 290th nickphe 657 67 9ms 19 Aug 2024 290th Unknownuserfrommars 657 67 9ms 20 Nov 2024 296th JGDoerrer 638 69 10ms 29 Jan 2022 297th 4hg 🇺🇸 629 70 16ms 27 Jan 2023 297th davbass 🇮🇹 629 70 9ms 29 Dec 2023 299th vodker1 620 71 10ms 9 Mar 2022 299th mdnestor 620 71 14ms 14 Dec 2022 299th juliusgeo 620 71 9ms 4 Feb 2023 299th aalec 620 71 63ms 4 May 2024 299th simplylu 620 71 9ms 5 Jan 2025 304th scpchicken 🇵🇼 611 72 10ms 18 Mar 2023 304th 0xBenCantCode 611 72 10ms 13 May 2023 306th HumanEquivalentUnit 603 73 10ms 12 Feb 2022 306th AdamHe17 603 73 17ms 15 Aug 2022 306th kellantech 603 73 17ms 4 Aug 2023 306th FortuiteMan 🇫🇷 603 73 17ms 20 Oct 2024 310th DrPiranoid 595 74 9ms 26 Sep 2022 310th JudeTyrrell 595 74 9ms 5 Oct 2024 312th adoxography 587 75 9ms 19 Feb 2022 312th Bonjour27891 🇻🇳 587 75 16ms 19 Feb 2022 312th jhpaques 🇫🇷 587 75 11ms 29 Sep 2022 312th Troon 587 75 11ms 4 Nov 2022 312th olivermrose 🇺🇸 587 75 16ms 16 Jan 2023 312th jhu04 587 75 10ms 23 Jun 2023 312th dahappy1989 587 75 9ms 5 Nov 2023 319th jacklynnepenick 579 76 9ms 15 Feb 2022 319th Andrey135296 579 76 10ms 4 Apr 2022 First 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