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 474th Demonarchet 797 79 21ms 18 Apr 2023 474th dtaylor0 797 79 19ms 23 May 2023 474th bac0id 797 79 20ms 26 Sep 2023 474th neonchickens 797 79 30ms 6 Oct 2023 474th MWI-polygolf 797 79 21ms 6 Dec 2023 474th eddvrs 797 79 24ms 22 Dec 2023 474th tknight00 797 79 27ms 7 Mar 2024 474th thienudomsrirungruang 797 79 49ms 3 May 2024 474th IsaacAlexBarden 797 79 33ms 6 Feb 2025 474th taesungh 797 79 24ms 7 Jun 2025 474th benvreeves 797 79 20ms 25 Jul 2025 474th saturzay 797 79 27ms 19 Aug 2025 474th TransformLikeATensor 797 79 20ms 16 Oct 2025 474th tomh1012 797 79 24ms 3 Dec 2025 474th JesseNoEyes 🇺🇸 797 79 20ms 15 Jan 2026 474th milktea-ish 797 79 22ms 5 Mar 2026 497th j-Ewan 788 80 21ms 13 May 2022 497th osmith93 788 80 35ms 14 Jun 2022 497th hjcafaroUC 788 80 26ms 21 Jun 2022 497th dankleeman 788 80 19ms 8 Aug 2022 497th dillon-duncando 788 80 22ms 4 Oct 2022 497th DrPiranoid 788 80 24ms 11 Nov 2022 497th mdnestor 788 80 23ms 23 Dec 2022 497th Edjyzod 788 80 17ms 7 Mar 2023 497th henry-von-wichert 788 80 25ms 31 Mar 2023 497th Hortaros 788 80 21ms 16 Apr 2023 497th ankeetparikh 788 80 20ms 5 May 2023 497th Neonader 788 80 26ms 9 May 2023 497th nickgza 788 80 18ms 17 Aug 2023 497th MiranDaniel 🇨🇿 788 80 27ms 30 Aug 2023 497th Fanrco 788 80 19ms 31 Aug 2023 497th nyoshe 788 80 20ms 10 Oct 2023 497th AzroyAr 788 80 28ms 28 Dec 2023 497th Alex-Huggett 🇬🇧 788 80 58ms 13 Apr 2024 497th RobertHoeh 788 80 27ms 27 May 2024 497th LorenzoDeGaspari 788 80 24ms 27 May 2024 497th AstroOrbis 788 80 28ms 7 May 2025 497th vgamula 🇺🇦 788 80 23ms 16 Jul 2025 497th imoxyg 788 80 29ms 29 Aug 2025 497th Tristanchaang 788 80 22ms 13 Nov 2025 497th someCoder-a11y 788 80 17ms 4 hours ago 522nd abba23 778 81 28ms 26 May 2022 522nd docd 778 81 19ms 8 Aug 2022 522nd Smetalo 778 81 29ms 25 Aug 2022 522nd glesnick 778 81 25ms 6 Sep 2022 522nd Yareeeema 778 81 25ms 3 Nov 2022 522nd RandGuy 778 81 27ms 23 Nov 2022 522nd GWStuart 778 81 25ms 19 Dec 2022 522nd wa1ker38552 778 81 21ms 22 May 2023 522nd LimaoC 778 81 23ms 11 Aug 2023 522nd robertovers 778 81 24ms 2 Oct 2023 522nd HanaEndUser 778 81 20ms 15 Feb 2024 522nd Loag 778 81 19ms 22 Sep 2024 522nd julian-hoelz 778 81 18ms 23 Sep 2024 522nd GoldStar184 778 81 23ms 27 Nov 2024 522nd mchalunderscore 778 81 24ms 5 Jan 2025 522nd csharpython 778 81 15ms 2 Aug 2025 522nd ImanolCiganda 778 81 27ms 26 Feb 2026 522nd cuvam 778 81 25ms 24 hours ago 540th Ailko 🇧🇪 768 82 27ms 12 May 2022 540th joshmoody24 768 82 27ms 12 May 2022 540th andrewgopher 768 82 20ms 25 Jun 2022 540th estomagordo 🇳🇱 768 82 25ms 26 Oct 2022 540th ellis-rix 768 82 25ms 14 Nov 2022 540th twocatsinatrenchcoat 768 82 19ms 29 Nov 2022 540th aid-f 768 82 24ms 21 Mar 2023 540th henrydukepickle 768 82 18ms 8 Dec 2023 540th amollberg 🇸🇪 768 82 25ms 3 Jan 2024 540th mrmena 🇦🇺 768 82 29ms 19 Mar 2024 540th rifatx 768 82 26ms 16 Jul 2024 540th NicoH76 768 82 19ms 24 Apr 2025 540th 0dyse 768 82 27ms 29 Apr 2025 540th gamk3 768 82 19ms 6 May 2025 540th some-function 768 82 21ms 2 Jul 2025 540th jacekwladzinski 768 82 25ms 12 Nov 2025 540th Arkadios200 768 82 31ms 9 days ago 557th bonevbs 759 83 22ms 8 May 2022 557th feherd 759 83 19ms 20 May 2022 557th pbleich 759 83 24ms 24 Aug 2022 557th RoscoeSmith 759 83 26ms 20 Nov 2022 First Prev 481–560 of 852 Next Last