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 Lily 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 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 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 369th kawrei 829 76 29ms 4 May 2025 369th RaBa21 🇭🇺 829 76 27ms 19 Jul 2025 369th mathieurodic 829 76 36ms 21 Oct 2025 369th DrakeSeteraO 829 76 53ms 24 Oct 2025 369th yoikolover 829 76 25ms 11 Dec 2025 369th matricronia 829 76 27ms 9 days ago 407th cooljoseph1 818 77 24ms 6 May 2022 407th krcs 🇵🇱 818 77 22ms 11 May 2022 407th kenballus 818 77 28ms 13 Jul 2022 407th 104210 818 77 28ms 29 Jul 2022 407th andre-de-lorde 818 77 21ms 1 Sep 2022 407th zstephe 818 77 27ms 2 Dec 2022 407th badboj40 818 77 24ms 27 Dec 2022 407th henrytranter 818 77 30ms 11 Jan 2023 407th DragonaireM 818 77 22ms 6 Feb 2023 407th steffan-polygolf 818 77 19ms 19 Feb 2023 407th kellantech 818 77 19ms 21 May 2023 407th Ty-Cyr 818 77 19ms 14 Jul 2023 407th camieac 🇬🇧 818 77 23ms 14 Jul 2023 407th nathsou 🇫🇷 818 77 22ms 2 Sep 2023 407th MisterrLuck 818 77 23ms 7 Sep 2023 407th alexjurkiewicz 🇦🇺 818 77 20ms 7 Nov 2023 407th askipio 818 77 23ms 22 Nov 2023 407th trinityy-7 818 77 24ms 17 Dec 2023 407th zwxzwxzwx21 818 77 23ms 30 Jan 2024 407th PyryL 🇫🇮 818 77 20ms 23 Aug 2024 407th CyberTapir 818 77 25ms 27 Aug 2024 407th junten1 818 77 25ms 20 Oct 2024 407th croc54 818 77 26ms 24 Dec 2024 407th za3k 818 77 24ms 3 Jun 2025 407th robin-scragg 818 77 19ms 17 Aug 2025 407th j-zhang43 818 77 25ms 17 Nov 2025 433rd AGoyet 808 78 25ms 29 Jul 2022 433rd RYNO8 808 78 23ms 16 Aug 2022 433rd TheCod-r 🇦🇶 808 78 27ms 28 Sep 2022 433rd Marthe-CC 808 78 24ms 9 Oct 2022 433rd Wildst 808 78 19ms 2 Nov 2022 433rd nmgetahun 808 78 22ms 4 Dec 2022 433rd Techdude01 808 78 25ms 13 Dec 2022 433rd tvcv901 808 78 19ms 22 Mar 2023 433rd oceko 808 78 22ms 24 Mar 2023 433rd yoyoyonono 808 78 26ms 15 May 2023 433rd Nic0M 808 78 23ms 13 Aug 2023 433rd ssbhatt4321 808 78 25ms 14 Oct 2023 433rd wyarde 808 78 19ms 7 Nov 2023 433rd ItsEthanXYZ 808 78 19ms 24 Dec 2023 433rd adamreidsmith 808 78 26ms 16 Feb 2024 433rd Jacob385 808 78 60ms 5 Mar 2024 433rd DGipe 808 78 23ms 13 May 2024 433rd cyxv 808 78 27ms 2 Aug 2024 433rd gallium-gonzollium 808 78 26ms 26 Aug 2024 433rd Europe2048 808 78 19ms 24 Nov 2024 433rd GeneralFabian 808 78 27ms 14 Dec 2024 433rd skaravind 808 78 20ms 18 days ago 433rd samuel-thesing 🇩🇪 808 78 26ms 9 days ago 456th kevdah 797 79 25ms 27 May 2022 456th jacklynnepenick 797 79 20ms 22 Jun 2022 456th james-downey 797 79 28ms 9 Jul 2022 456th andre-lameirinhas 🇵🇹 797 79 23ms 26 Jul 2022 456th hamsterskywalker 797 79 21ms 7 Sep 2022 456th Pena86 797 79 26ms 14 Sep 2022 456th hymanimy 797 79 27ms 24 Nov 2022 456th Demonarchet 797 79 19ms 18 Apr 2023 456th dtaylor0 797 79 20ms 23 May 2023 456th bac0id 797 79 19ms 26 Sep 2023 456th neonchickens 797 79 26ms 6 Oct 2023 456th MWI-polygolf 797 79 20ms 6 Dec 2023 456th eddvrs 797 79 22ms 22 Dec 2023 456th tknight00 797 79 26ms 7 Mar 2024 456th thienudomsrirungruang 797 79 48ms 3 May 2024 456th IsaacAlexBarden 797 79 25ms 6 Feb 2025 456th taesungh 797 79 23ms 7 Jun 2025 456th benvreeves 797 79 21ms 25 Jul 2025 456th saturzay 797 79 27ms 19 Aug 2025 456th TransformLikeATensor 797 79 19ms 16 Oct 2025 456th tomh1012 797 79 23ms 3 Dec 2025 456th JesseNoEyes 🇺🇸 797 79 19ms 22 days ago 478th j-Ewan 788 80 21ms 13 May 2022 478th osmith93 788 80 33ms 14 Jun 2022 478th hjcafaroUC 788 80 30ms 21 Jun 2022 First Prev 401–480 of 823 Next 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