The Calendar hole will go live in approximately 11 days. Why not try and solve it ahead of time?
Collatz 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 313th destofr 840 75 19ms 25 Aug 2022 313th vishwathg 840 75 50ms 10 Oct 2022 313th nkoppel 840 75 19ms 19 Oct 2022 313th AZ9tumas 840 75 19ms 23 Oct 2022 313th EthanGrant1 840 75 22ms 7 Nov 2022 313th Omega65536 🇩🇪 840 75 18ms 24 Nov 2022 313th b10011 🇫🇮 840 75 24ms 3 Jan 2023 313th 4ndyJ 🇬🇧 840 75 21ms 3 Jan 2023 313th randolchance 840 75 18ms 8 Jan 2023 313th LeeCamp 840 75 17ms 12 Jan 2023 313th hellwue 840 75 19ms 15 Feb 2023 313th nandanjp 840 75 19ms 29 Mar 2023 313th kaptsanovb 840 75 24ms 20 Apr 2023 313th galloj 🇨🇿 840 75 18ms 20 May 2023 313th jhu04 840 75 21ms 23 Jun 2023 313th HelloYuiYui 840 75 19ms 1 Nov 2023 313th tobyLovick 840 75 25ms 10 Nov 2023 313th VictorStenvers 🇳🇱 840 75 22ms 13 Nov 2023 313th RZ781 840 75 29ms 19 Nov 2023 313th mikehanus 840 75 23ms 21 Nov 2023 313th 1231234md5 🇨🇳 840 75 18ms 14 Dec 2023 313th Hebelub 840 75 27ms 6 Jan 2024 313th minhtrancccp 840 75 22ms 11 Jan 2024 313th 123mjb 840 75 23ms 25 Jan 2024 313th jbjd 840 75 22ms 25 Feb 2024 313th gabe-gallegos 840 75 19ms 2 May 2024 313th kejcao 🇨🇦 840 75 23ms 11 May 2024 313th f-tucker 840 75 22ms 24 May 2024 313th Florian-Mt 840 75 24ms 22 Jul 2024 313th codingisgreatbutiamnot 840 75 19ms 9 Aug 2024 313th Terobero 840 75 30ms 23 Aug 2024 313th abhishekg999 840 75 53ms 17 Sep 2024 313th RedzGoose 🇦🇺 840 75 23ms 7 Oct 2024 313th Clay-Goodling 840 75 24ms 8 Oct 2024 313th JunkIce 840 75 24ms 5 Mar 2025 313th jiji7879 840 75 23ms 20 Jun 2025 313th faragocsaba 840 75 24ms 22 Jun 2025 313th bknower 840 75 19ms 30 Jun 2025 313th clayboll99 840 75 21ms 14 Jul 2025 313th Nikinator2704 840 75 19ms 1 Nov 2025 313th mmoffitt 840 75 24ms 19 Nov 2025 313th AdrienHache 🇫🇷 840 75 20ms 8 hours ago 363rd guilhem-roy 🇫🇷 829 76 24ms 5 May 2022 363rd NewDefectus 🇮🇱 829 76 21ms 6 May 2022 363rd CuboidRaptor 🇨🇦 829 76 23ms 25 May 2022 363rd TheSmilingTurtle 829 76 26ms 5 Jun 2022 363rd Romain-1 🇫🇷 829 76 18ms 8 Jun 2022 363rd jhpaques 🇫🇷 829 76 25ms 30 Jul 2022 363rd chriscianfarani 829 76 24ms 10 Aug 2022 363rd eshilo-draper 829 76 22ms 13 Sep 2022 363rd suwat513 829 76 19ms 22 Sep 2022 363rd Jaydosu 829 76 22ms 14 Nov 2022 363rd tails618 829 76 26ms 2 Dec 2022 363rd KevinLyvers 829 76 19ms 17 Dec 2022 363rd nayakrujul 829 76 19ms 3 Jan 2023 363rd CheeseCake628 🇳🇴 829 76 22ms 8 Jan 2023 363rd CatsAreFluffy 829 76 24ms 18 Feb 2023 363rd adamnielson42 🇺🇸 829 76 20ms 1 Mar 2023 363rd Schreipfelerer 829 76 26ms 9 Apr 2023 363rd hm5822 829 76 25ms 22 Apr 2023 363rd celiendonze 🇨🇭 829 76 25ms 5 Jul 2023 363rd brochmann 🇸🇪 829 76 21ms 13 Aug 2023 363rd Command-Master 829 76 35ms 2 Oct 2023 363rd chartung17 829 76 20ms 17 Dec 2023 363rd smokestacklightnin 🇺🇸 829 76 26ms 10 Jan 2024 363rd NickTheEASDude 🇺🇸 829 76 51ms 26 Jan 2024 363rd yuchuehw 829 76 25ms 2 Feb 2024 363rd Azearia 829 76 26ms 26 Feb 2024 363rd tpasfieldERAU 829 76 23ms 18 May 2024 363rd khavik 829 76 28ms 29 May 2024 363rd Ythaenagor 829 76 23ms 5 Aug 2024 363rd martion2007 829 76 49ms 9 Aug 2024 363rd sjrct 829 76 25ms 10 Aug 2024 363rd Mathrew2012 829 76 16ms 9 Nov 2024 363rd kawrei 829 76 29ms 4 May 2025 363rd RaBa21 🇭🇺 829 76 24ms 19 Jul 2025 363rd mathieurodic 829 76 27ms 21 Oct 2025 363rd DrakeSeteraO 829 76 52ms 24 Oct 2025 363rd yoikolover 829 76 23ms 9 days ago 400th cooljoseph1 818 77 23ms 6 May 2022 First Prev 321–400 of 811 Next Last
