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 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 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 ><> ALGOL 68 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 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 ><> ALGOL 68 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 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 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 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 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 461st tomh1012 797 79 23ms 3 Dec 2025 461st JesseNoEyes 🇺🇸 797 79 19ms 15 Jan 2026 461st denkyuu1 797 79 20ms 11 days ago 484th j-Ewan 788 80 21ms 13 May 2022 484th osmith93 788 80 33ms 14 Jun 2022 484th hjcafaroUC 788 80 26ms 21 Jun 2022 484th dankleeman 788 80 21ms 8 Aug 2022 484th dillon-duncando 788 80 23ms 4 Oct 2022 484th DrPiranoid 788 80 25ms 11 Nov 2022 484th mdnestor 788 80 24ms 23 Dec 2022 484th Edjyzod 788 80 16ms 7 Mar 2023 484th henry-von-wichert 788 80 26ms 31 Mar 2023 484th Hortaros 788 80 23ms 16 Apr 2023 484th ankeetparikh 788 80 21ms 5 May 2023 484th Neonader 788 80 28ms 9 May 2023 484th nickgza 788 80 18ms 17 Aug 2023 484th MiranDaniel 🇨🇿 788 80 26ms 30 Aug 2023 484th Fanrco 788 80 18ms 31 Aug 2023 484th nyoshe 788 80 20ms 10 Oct 2023 484th AzroyAr 788 80 28ms 28 Dec 2023 484th Alex-Huggett 🇬🇧 788 80 55ms 13 Apr 2024 484th RobertHoeh 788 80 28ms 27 May 2024 484th LorenzoDeGaspari 788 80 23ms 27 May 2024 484th AstroOrbis 788 80 26ms 7 May 2025 484th vgamula 🇺🇦 788 80 22ms 16 Jul 2025 484th imoxyg 788 80 23ms 29 Aug 2025 484th Tristanchaang 788 80 22ms 13 Nov 2025 508th abba23 778 81 26ms 26 May 2022 508th docd 778 81 18ms 8 Aug 2022 508th Smetalo 778 81 26ms 25 Aug 2022 508th glesnick 778 81 23ms 6 Sep 2022 508th Yareeeema 778 81 25ms 3 Nov 2022 508th RandGuy 778 81 26ms 23 Nov 2022 508th GWStuart 778 81 24ms 19 Dec 2022 508th wa1ker38552 778 81 19ms 22 May 2023 508th LimaoC 778 81 24ms 11 Aug 2023 508th robertovers 778 81 23ms 2 Oct 2023 508th HanaEndUser 778 81 19ms 15 Feb 2024 508th Loag 778 81 18ms 22 Sep 2024 508th julian-hoelz 778 81 19ms 23 Sep 2024 508th GoldStar184 778 81 24ms 27 Nov 2024 508th jastrzumb 778 81 24ms 5 Jan 2025 508th csharpython 778 81 17ms 2 Aug 2025 508th ImanolCiganda 778 81 25ms 3 days ago 525th Ailko 🇧🇪 768 82 27ms 12 May 2022 525th joshmoody24 768 82 25ms 12 May 2022 525th andrewgopher 768 82 20ms 25 Jun 2022 525th estomagordo 🇳🇱 768 82 23ms 26 Oct 2022 525th ThatAlo 768 82 25ms 14 Nov 2022 525th twocatsinatrenchcoat 768 82 18ms 29 Nov 2022 525th aid-f 768 82 23ms 21 Mar 2023 525th henrydukepickle 768 82 18ms 8 Dec 2023 525th amollberg 🇸🇪 768 82 24ms 3 Jan 2024 525th mrmena 🇦🇺 768 82 29ms 19 Mar 2024 525th rifatx 768 82 24ms 16 Jul 2024 525th NicoH76 768 82 18ms 24 Apr 2025 525th 0dyse 768 82 29ms 29 Apr 2025 525th gamk3 768 82 19ms 6 May 2025 525th some-function 768 82 18ms 2 Jul 2025 525th jacekwladzinski 768 82 24ms 12 Nov 2025 541st bonevbs 759 83 20ms 8 May 2022 541st feherd 759 83 19ms 20 May 2022 541st pbleich 759 83 24ms 24 Aug 2022 541st RoscoeSmith 759 83 24ms 20 Nov 2022 541st amadeusdotpng 759 83 18ms 22 Apr 2023 541st ross-i 759 83 18ms 5 Jul 2023 541st anonymaew 759 83 27ms 2 Aug 2023 541st mstang107 759 83 24ms 20 Dec 2023 541st LHLaurini 🇧🇷 759 83 19ms 26 Jun 2024 541st C0derX3 🇺🇸 759 83 22ms 18 Sep 2024 541st ComputerKWasTaken 🇺🇸 759 83 23ms 20 Jan 2025 541st Vexxter9 🇳🇱 759 83 57ms 4 Feb 2025 541st CodyKlingler 759 83 23ms 7 Feb 2025 541st OyuDays 759 83 19ms 17 Mar 2025 541st julianreece 759 83 23ms 29 Apr 2025 541st rustykitty 🇺🇸 759 83 21ms 24 Oct 2025 541st Kinkade76 759 83 26ms 24 days ago 541st parthm2005 759 83 16ms 25 hours ago 559th Feniske 🇫🇷 750 84 20ms 7 Oct 2022 559th Eilonlif 🇮🇱 750 84 22ms 29 Mar 2023 First Prev 481–560 of 833 Next Last