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 Calendar Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz Continued Fractions 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 Gray Code Decoder Gray Code Encoder 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 Multitap Input 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 Alphabetic Numbers Apéry’s Constant Binary Lambda Calculus Connect Four Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Hexagonal Spiral Highly Composite Numbers NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Rectangle Fill Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial All Languages ><> ALGOL 68 ArkScript 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 APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Lily Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Bytes Chars Scoring Bytes Chars Language All ><> ALGOL 68 ArkScript 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 APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Lily 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 Calendar Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz Continued Fractions 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 Gray Code Decoder Gray Code Encoder 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 Multitap Input 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 Alphabetic Numbers Apéry’s Constant Binary Lambda Calculus Connect Four Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Hexagonal Spiral Highly Composite Numbers NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Rectangle Fill Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial # Golfer Points Bytes Time Submitted 377th yuchuehw 829 76 29ms 2 Feb 2024 377th Azearia 829 76 27ms 26 Feb 2024 377th tpasfieldERAU 829 76 24ms 18 May 2024 377th khavik 829 76 27ms 29 May 2024 377th Ythaenagor 829 76 23ms 5 Aug 2024 377th martion2007 829 76 56ms 9 Aug 2024 377th sjrct 829 76 28ms 10 Aug 2024 377th Mathrew2012 829 76 16ms 9 Nov 2024 377th kawrei 829 76 28ms 4 May 2025 377th RaBa21 🇭🇺 829 76 26ms 19 Jul 2025 377th mathieurodic 829 76 26ms 21 Oct 2025 377th DrakeSeteraO 829 76 54ms 24 Oct 2025 377th yoikolover 829 76 26ms 11 Dec 2025 377th matricronia 829 76 28ms 28 Jan 2026 377th muser-logiccpu 🇺🇦 829 76 25ms 24 Feb 2026 377th Ignacio6D2 829 76 20ms 26 Feb 2026 377th mkikta 829 76 27ms 6 hours ago 418th cooljoseph1 818 77 24ms 6 May 2022 418th krcs 🇵🇱 818 77 22ms 11 May 2022 418th kenballus 818 77 26ms 13 Jul 2022 418th 104210 818 77 26ms 29 Jul 2022 418th andre-de-lorde 818 77 20ms 1 Sep 2022 418th zstephe 818 77 28ms 2 Dec 2022 418th badboj40 818 77 25ms 27 Dec 2022 418th henrytranter 818 77 25ms 11 Jan 2023 418th DragonaireM 818 77 24ms 6 Feb 2023 418th steffan-polygolf 818 77 21ms 19 Feb 2023 418th kellantech 818 77 20ms 21 May 2023 418th Ty-Cyr 818 77 19ms 14 Jul 2023 418th camieac 🇬🇧 818 77 23ms 14 Jul 2023 418th nathsou 🇫🇷 818 77 21ms 2 Sep 2023 418th MisterrLuck 818 77 24ms 7 Sep 2023 418th alexjurkiewicz 🇦🇺 818 77 20ms 7 Nov 2023 418th askipio 818 77 23ms 22 Nov 2023 418th trinityy-7 818 77 23ms 17 Dec 2023 418th zwxzwxzwx21 818 77 25ms 30 Jan 2024 418th PyryL 🇫🇮 818 77 20ms 23 Aug 2024 418th CyberTapir 818 77 25ms 27 Aug 2024 418th junten1 818 77 27ms 20 Oct 2024 418th croc54 818 77 28ms 24 Dec 2024 418th za3k 818 77 26ms 3 Jun 2025 418th robin-scragg 818 77 26ms 17 Aug 2025 418th j-zhang43 818 77 23ms 17 Nov 2025 418th Andrey2001 818 77 24ms 8 days ago 445th AGoyet 808 78 25ms 29 Jul 2022 445th RYNO8 808 78 23ms 16 Aug 2022 445th TheCod-r 🇦🇶 808 78 27ms 28 Sep 2022 445th Marthe-CC 808 78 23ms 9 Oct 2022 445th Wildst 808 78 24ms 2 Nov 2022 445th nmgetahun 808 78 24ms 4 Dec 2022 445th Techdude01 808 78 25ms 13 Dec 2022 445th tvcv901 808 78 21ms 22 Mar 2023 445th oceko 808 78 20ms 24 Mar 2023 445th yoyoyonono 808 78 27ms 15 May 2023 445th Nic0M 808 78 20ms 13 Aug 2023 445th ssbhatt4321 808 78 26ms 14 Oct 2023 445th wyarde 808 78 21ms 7 Nov 2023 445th ItsEthanDev 808 78 21ms 24 Dec 2023 445th adamreidsmith 808 78 30ms 16 Feb 2024 445th Jacob385 808 78 60ms 5 Mar 2024 445th DGipe 808 78 23ms 13 May 2024 445th cyxv 808 78 27ms 2 Aug 2024 445th gallium-gonzollium 808 78 28ms 26 Aug 2024 445th Europe2048 808 78 20ms 24 Nov 2024 445th GeneralFabian 808 78 27ms 14 Dec 2024 445th skaravind 808 78 23ms 19 Jan 2026 445th samuel-thesing 🇩🇪 808 78 29ms 28 Jan 2026 445th SectorCorruptor 808 78 32ms 1 Mar 2026 445th Deppyforce 808 78 20ms 27 days ago 445th denkyuu1 808 78 22ms 13 days ago 471st kevdah 797 79 22ms 27 May 2022 471st jacklynnepenick 797 79 19ms 22 Jun 2022 471st james-downey 797 79 25ms 9 Jul 2022 471st andre-lameirinhas 🇵🇹 797 79 24ms 26 Jul 2022 471st hamsterskywalker 797 79 21ms 7 Sep 2022 471st Pena86 797 79 28ms 14 Sep 2022 471st hymanimy 797 79 26ms 24 Nov 2022 471st Demonarchet 797 79 21ms 18 Apr 2023 471st dtaylor0 797 79 19ms 23 May 2023 471st 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