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 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 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 Apéry’s Constant Binary Lambda Calculus 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 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 ArkScript 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 ArkScript 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 Calendar 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 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 Apéry’s Constant Binary Lambda Calculus 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 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 368th RaBa21 🇭🇺 829 76 24ms 19 Jul 2025 368th mathieurodic 829 76 27ms 21 Oct 2025 368th DrakeSeteraO 829 76 52ms 24 Oct 2025 368th yoikolover 829 76 23ms 11 Dec 2025 368th matricronia 829 76 29ms 3 days ago 406th cooljoseph1 818 77 23ms 6 May 2022 406th krcs 🇵🇱 818 77 21ms 11 May 2022 406th kenballus 818 77 22ms 13 Jul 2022 406th 104210 818 77 22ms 29 Jul 2022 406th andre-de-lorde 818 77 21ms 1 Sep 2022 406th zstephe 818 77 24ms 2 Dec 2022 406th badboj40 818 77 23ms 27 Dec 2022 406th henrytranter 818 77 27ms 11 Jan 2023 406th DragonaireM 818 77 23ms 6 Feb 2023 406th steffan-polygolf 818 77 19ms 19 Feb 2023 406th kellantech 818 77 19ms 21 May 2023 406th Ty-Cyr 818 77 18ms 14 Jul 2023 406th camieac 🇬🇧 818 77 21ms 14 Jul 2023 406th nathsou 🇫🇷 818 77 21ms 2 Sep 2023 406th MisterrLuck 818 77 22ms 7 Sep 2023 406th alexjurkiewicz 🇦🇺 818 77 19ms 7 Nov 2023 406th askipio 818 77 23ms 22 Nov 2023 406th trinityy-7 818 77 23ms 17 Dec 2023 406th zwxzwxzwx21 818 77 23ms 30 Jan 2024 406th PyryL 🇫🇮 818 77 20ms 23 Aug 2024 406th CyberTapir 818 77 23ms 27 Aug 2024 406th junten1 818 77 26ms 20 Oct 2024 406th croc54 818 77 23ms 24 Dec 2024 406th za3k 818 77 23ms 3 Jun 2025 406th robin-scragg 818 77 18ms 17 Aug 2025 406th j-zhang43 818 77 19ms 17 Nov 2025 432nd AGoyet 808 78 22ms 29 Jul 2022 432nd RYNO8 808 78 21ms 16 Aug 2022 432nd TheCod-r 🇦🇶 808 78 25ms 28 Sep 2022 432nd Marthe-CC 808 78 23ms 9 Oct 2022 432nd Wildst 808 78 20ms 2 Nov 2022 432nd nmgetahun 808 78 22ms 4 Dec 2022 432nd Techdude01 808 78 26ms 13 Dec 2022 432nd tvcv901 808 78 23ms 22 Mar 2023 432nd oceko 808 78 19ms 24 Mar 2023 432nd yoyoyonono 808 78 25ms 15 May 2023 432nd Nic0M 808 78 18ms 13 Aug 2023 432nd ssbhatt4321 808 78 23ms 14 Oct 2023 432nd wyarde 808 78 19ms 7 Nov 2023 432nd ItsEthanXYZ 808 78 19ms 24 Dec 2023 432nd adamreidsmith 808 78 25ms 16 Feb 2024 432nd Jacob385 808 78 59ms 5 Mar 2024 432nd DGipe 808 78 22ms 13 May 2024 432nd cyxv 808 78 24ms 2 Aug 2024 432nd gallium-gonzollium 808 78 25ms 26 Aug 2024 432nd Europe2048 808 78 19ms 24 Nov 2024 432nd GeneralFabian 808 78 25ms 14 Dec 2024 432nd skaravind 808 78 18ms 13 days ago 432nd samuel-thesing 🇩🇪 808 78 25ms 4 days ago 455th kevdah 797 79 24ms 27 May 2022 455th jacklynnepenick 797 79 17ms 22 Jun 2022 455th james-downey 797 79 25ms 9 Jul 2022 455th andre-lameirinhas 🇵🇹 797 79 22ms 26 Jul 2022 455th hamsterskywalker 797 79 19ms 7 Sep 2022 455th Pena86 797 79 25ms 14 Sep 2022 455th hymanimy 797 79 26ms 24 Nov 2022 455th Demonarchet 797 79 19ms 18 Apr 2023 455th dtaylor0 797 79 20ms 23 May 2023 455th bac0id 797 79 19ms 26 Sep 2023 455th neonchickens 797 79 25ms 6 Oct 2023 455th MWI-polygolf 797 79 19ms 6 Dec 2023 455th eddvrs 797 79 22ms 22 Dec 2023 455th tknight00 797 79 26ms 7 Mar 2024 455th thienudomsrirungruang 797 79 44ms 3 May 2024 455th IsaacAlexBarden 797 79 23ms 6 Feb 2025 455th taesungh 797 79 24ms 7 Jun 2025 455th benvreeves 797 79 20ms 25 Jul 2025 455th saturzay 797 79 25ms 19 Aug 2025 455th TransformLikeATensor 797 79 20ms 16 Oct 2025 455th tomh1012 797 79 23ms 3 Dec 2025 455th JesseNoEyes 🇺🇸 797 79 20ms 17 days ago 477th j-Ewan 788 80 20ms 13 May 2022 477th osmith93 788 80 32ms 14 Jun 2022 477th hjcafaroUC 788 80 25ms 21 Jun 2022 477th dankleeman 788 80 20ms 8 Aug 2022 First Prev 401–480 of 821 Next 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