The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
Collatz 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 240th RDShah 770 74 18ms 6 May 2022 240th Indivicivet 770 74 19ms 9 May 2022 240th CedricGebistorf 770 74 17ms 9 May 2022 240th ophact 770 74 21ms 11 May 2022 240th ImpressedByRocks 770 74 18ms 17 May 2022 240th LHuitre 770 74 18ms 2 Jun 2022 240th neihousaigaai 770 74 17ms 8 Jun 2022 240th rowboat1 770 74 18ms 10 Jun 2022 240th inverseLorentz 🇦🇺 770 74 18ms 13 Jun 2022 240th clementblaudeau 770 74 22ms 29 Jun 2022 240th adoxography 770 74 19ms 13 Jul 2022 240th Attero 🇸🇪 770 74 19ms 20 Jul 2022 240th Heathcorp 🇦🇺 770 74 18ms 27 Jul 2022 240th jfallon1997 770 74 18ms 11 Aug 2022 240th VictorFordham 770 74 24ms 26 Aug 2022 240th georgehulme 770 74 21ms 1 Sep 2022 240th smartiel 770 74 18ms 15 Sep 2022 240th trist224 🇫🇷 770 74 18ms 21 Sep 2022 240th Kloppermand 🇩🇰 770 74 20ms 7 Oct 2022 240th knutae 🇳🇴 770 74 18ms 9 Oct 2022 240th Troon 770 74 19ms 14 Oct 2022 240th MaxElf999 770 74 20ms 14 Oct 2022 240th SniperSmiley 🇺🇸 770 74 18ms 6 Dec 2022 240th elephantpanda 770 74 23ms 10 Dec 2022 240th ArthurBond 770 74 18ms 19 Dec 2022 240th Larspolo 770 74 18ms 25 Dec 2022 240th dcc5480 770 74 20ms 12 Jan 2023 240th Ripick 770 74 19ms 1 Feb 2023 240th m3nt0ras 🇬🇷 770 74 18ms 3 Feb 2023 240th Skwerl23 770 74 20ms 5 Feb 2023 240th frankgraziano 770 74 18ms 19 Feb 2023 240th KenanHanke 770 74 19ms 21 Feb 2023 240th DanielPeterssonAI 770 74 19ms 13 Mar 2023 240th jiaminglimjm 🇲🇾 770 74 18ms 20 Mar 2023 240th ejini6969 770 74 19ms 22 Mar 2023 240th GulgDev 770 74 18ms 22 Mar 2023 240th vrnprkh 770 74 19ms 30 Mar 2023 240th RuyiLi 770 74 18ms 1 Apr 2023 240th StardustGogeta 770 74 18ms 7 May 2023 240th zbreit 🇺🇸 770 74 19ms 7 May 2023 240th kyleclaassen 770 74 19ms 20 May 2023 240th mbittner20 770 74 19ms 27 May 2023 240th tweska 🇳🇱 770 74 18ms 5 Jun 2023 240th cros107 🇦🇺 770 74 18ms 11 Aug 2023 240th yourlefthandman 770 74 18ms 16 Aug 2023 240th daisyyedda 770 74 21ms 17 Aug 2023 240th cesarm4 770 74 18ms 29 Aug 2023 240th midnattssol 🇸🇪 770 74 18ms 22 Sep 2023 240th lambda-abstraction 770 74 20ms 21 Oct 2023 240th levavft 770 74 18ms 26 Oct 2023 240th Buecherfresser 770 74 19ms 22 Nov 2023 240th anarconic 770 74 51ms 8 Dec 2023 240th azure-blondon 770 74 18ms 11 Dec 2023 240th kurkale6ka 770 74 20ms 20 Dec 2023 240th Anonymousellama21 770 74 20ms 14 Mar 2024 240th Bmrl7 770 74 21ms 23 Mar 2024 240th cefqrn 770 74 19ms 26 May 2024 240th drochom 770 74 18ms 18 Jun 2024 240th hiichbindermax 770 74 18ms 22 Jun 2024 240th madex 🇩🇪 770 74 18ms 9 Jul 2024 240th cykim8811 770 74 46ms 11 Jul 2024 240th imelxr 🇮🇱 770 74 30ms 17 Aug 2024 240th EnTerr 770 74 21ms 25 Aug 2024 240th Mabeloid 🇳🇴 770 74 18ms 1 Sep 2024 240th madeforlosers 770 74 19ms 5 Sep 2024 240th LostSyntax21 🇬🇧 770 74 20ms 10 Sep 2024 240th Deedogg 770 74 19ms 11 Sep 2024 240th MassimoParisi 770 74 18ms 18 Sep 2024 240th agreegious 770 74 20ms 17 Nov 2024 240th Stockoh 🇫🇷 770 74 24ms 17 Nov 2024 240th Andrey135296 770 74 20ms 24 Nov 2024 240th TralfamadorianComedian 770 74 18ms 6 Dec 2024 240th bltnppcnt 770 74 32ms 3 Jan 2025 240th ZorblaxV 770 74 18ms 12 Jan 2025 240th yokasuretsu 770 74 19ms 13 Jan 2025 240th gdpr777 770 74 31ms 10 Feb 2025 240th Pyroan 770 74 21ms 27 Mar 2025 240th Squimbletin 770 74 22ms 19 Apr 2025 240th Dandandooo 770 74 21ms 23 Apr 2025 240th khangtm123 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