The Calendar hole will go live in approximately 11 days. Why not try and solve it ahead of time?
Catalan Numbers in Python 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 151st michelebastione 🇮🇹 898 49 11ms 8 Aug 2025 151st Chara-0x 898 49 9ms 18 Sep 2025 151st Europe2048 898 49 9ms 18 Oct 2025 151st QuincyNash 🇺🇸 898 49 9ms 21 days ago 151st yujh-yujh 🇬🇸 898 49 9ms 10 days ago 166th jrm5399 🇰🇿 880 50 9ms 30 Jan 2022 166th Freddiechang 880 50 9ms 8 Mar 2024 168th ToE42 863 51 9ms 31 Jan 2022 168th kyleclaassen 863 51 9ms 12 Mar 2022 168th PiterAnnema 863 51 9ms 23 Mar 2022 168th OllieBoyne 🇬🇧 863 51 10ms 15 Apr 2022 168th TobyBoyne 🇬🇧 863 51 9ms 15 Apr 2022 168th SniperSmiley 🇺🇸 863 51 12ms 2 Jun 2022 168th abailey2020 🇺🇸 863 51 9ms 23 Jul 2022 168th suwat513 863 51 9ms 22 Sep 2022 168th 4ndyJ 🇬🇧 863 51 9ms 19 Jan 2023 168th CheeseCake628 🇳🇴 863 51 9ms 20 Feb 2023 168th aksyristos 863 51 9ms 4 Mar 2023 168th DanielPeterssonAI 863 51 9ms 15 Mar 2023 168th Erik-M-Larsson 863 51 9ms 4 Apr 2023 168th mbittner20 863 51 9ms 12 Jun 2023 168th elgan65536 863 51 10ms 6 Mar 2024 168th Alex-x90 🇺🇸 863 51 9ms 5 May 2024 168th Stockoh 🇫🇷 863 51 11ms 14 Jun 2024 168th bac0id 863 51 10ms 29 Jun 2024 168th abhishekg999 863 51 9ms 20 Sep 2024 168th Hyunwook-Kim-WV 863 51 9ms 7 Aug 2025 168th jacekwladzinski 863 51 9ms 2 Oct 2025 189th Herbert00709 🇵🇱 846 52 9ms 21 Feb 2024 189th namelessiw 846 52 11ms 19 Aug 2024 189th WillowWispy 846 52 9ms 13 Mar 2025 192nd ZakkkkAttackkkk 🇵🇭 830 53 10ms 30 Jan 2022 192nd iakolzin 830 53 9ms 27 May 2022 192nd nullie 830 53 9ms 7 Jun 2022 192nd yzhs 🇩🇪 830 53 9ms 22 Jun 2022 192nd markusgraube 830 53 11ms 24 Apr 2023 192nd mstang107 830 53 9ms 20 Dec 2023 192nd smokestacklightnin 🇺🇸 830 53 9ms 10 Jan 2024 192nd HumanoidCPU 830 53 16ms 27 May 2024 192nd Mabeloid 🇳🇴 830 53 10ms 21 Sep 2024 192nd agreegious 830 53 11ms 14 Nov 2024 192nd 0dyse 830 53 9ms 29 Apr 2025 192nd piano-miles 830 53 9ms 9 May 2025 204th msbranicky 815 54 10ms 23 Aug 2023 204th Code-Coder-coder 815 54 10ms 12 Oct 2025 206th 2011-Chan-Ethan 800 55 10ms 14 Jul 2023 206th cuboids 800 55 10ms 10 Jul 2024 206th jatloe 800 55 10ms 27 Sep 2024 206th Emutis 🇱🇹 800 55 11ms 27 Oct 2024 210th petroselo 786 56 9ms 12 Apr 2022 210th SB-945 786 56 9ms 10 Jul 2023 210th JunkIce 786 56 10ms 24 Nov 2024 210th kevinnaviapaiva 786 56 9ms 19 Dec 2024 210th wobblybits 786 56 10ms 19 Aug 2025 215th PrathamMehta08 772 57 11ms 6 Dec 2023 215th Terobero 772 57 12ms 21 Aug 2024 215th AtengChen 772 57 10ms 7 Sep 2024 215th Mick-Travis 772 57 11ms 8 Dec 2024 219th jbjd 759 58 10ms 25 Feb 2024 220th LeeCamp 733 60 9ms 9 Feb 2022 220th guilhem-roy 🇫🇷 733 60 9ms 22 Feb 2022 220th Eilonlif 🇮🇱 733 60 10ms 27 Aug 2022 220th LogicalJoe 733 60 9ms 18 Sep 2022 220th 5quiwyrm 733 60 10ms 22 Oct 2022 220th TaserTheFox 🇺🇸 733 60 9ms 9 Jan 2023 220th ljweel 733 60 10ms 13 Feb 2023 220th shellbertt 🇨🇦 733 60 9ms 27 Apr 2023 220th ssbhatt4321 733 60 9ms 11 Jun 2023 220th PeterTillema 🇳🇱 733 60 10ms 10 Oct 2023 220th kurkale6ka 733 60 9ms 21 Dec 2023 220th sultan 733 60 9ms 3 Mar 2024 220th alemelis 733 60 11ms 13 Oct 2024 220th csharpython 733 60 10ms 5 Aug 2025 220th BREMAUCY 🇫🇷 733 60 10ms 11 Aug 2025 235th knutae 🇳🇴 721 61 10ms 3 Feb 2022 235th cros107 🇦🇺 721 61 9ms 2 Nov 2022 235th Baxi-codes 721 61 10ms 24 Dec 2022 235th thatbirdguythatuknownot 721 61 9ms 14 Jan 2023 235th mathb0y512 721 61 9ms 20 Apr 2023 235th Mikey-Beep 🇬🇧 721 61 9ms 31 Aug 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