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 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 Multitap Input 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 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 Multitap Input 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 561st MichaelMBradley 🇨🇦 733 86 22ms 5 Jun 2022 561st Lemonz-13223 733 86 17ms 21 Sep 2022 561st Bodo171 733 86 24ms 24 Nov 2022 561st shibacho 🇯🇵 733 86 19ms 25 Nov 2022 561st Vaekor 733 86 20ms 9 Jul 2023 561st LeoVanderSteege 733 86 16ms 18 Nov 2023 561st Pale-Vessel 733 86 18ms 18 Dec 2023 561st tik25 733 86 27ms 28 Mar 2024 561st willschremmer 733 86 16ms 27 Apr 2024 561st jamiloBBKing 733 86 24ms 27 Jan 2025 561st AsishKunta 733 86 17ms 1 Apr 2025 561st Hemanthred2005 733 86 18ms 1 Apr 2025 561st Voltrifrodec 🇸🇰 733 86 22ms 19 Apr 2025 561st lurey99 733 86 17ms 23 Apr 2025 561st Alban-Boissard 733 86 23ms 14 Jun 2025 561st Arkadios200 733 86 25ms 21 Sep 2025 561st Andrey2001 733 86 24ms 27 Nov 2025 578th ToE42 724 87 17ms 19 Oct 2022 578th omri2001 724 87 22ms 19 Oct 2022 578th Skallos-s 724 87 22ms 5 Dec 2022 578th damoc1es 724 87 16ms 16 Apr 2023 578th michelebastione 🇮🇹 724 87 25ms 20 Dec 2023 578th clampcorder 724 87 17ms 24 Jan 2024 578th GitQuick 724 87 20ms 23 Feb 2024 578th EricSchraf 724 87 18ms 21 Mar 2024 578th salvatore-abello 724 87 20ms 5 Sep 2024 578th PotatoSaladOverlord 724 87 19ms 21 May 2025 578th Ibozz91 724 87 23ms 8 Jun 2025 578th Aquateraneal 724 87 17ms 13 Nov 2025 590th Andre3582 716 88 16ms 29 Oct 2022 590th Darknova2468 716 88 19ms 20 Nov 2022 590th Solsticely 716 88 19ms 20 Nov 2022 590th goGuru 716 88 19ms 21 Dec 2022 590th msbranicky 716 88 34ms 9 Aug 2023 590th gussy420 716 88 17ms 28 Oct 2023 590th Shynif 716 88 18ms 21 Feb 2024 590th asterized 716 88 20ms 24 Aug 2024 590th hippopotam00sehead 🇨🇦 716 88 19ms 11 Sep 2024 590th 08jne01 716 88 16ms 21 Nov 2024 590th davidludwik2370 716 88 19ms 14 Sep 2025 601st lovernj 708 89 23ms 23 Aug 2022 601st Roj 708 89 22ms 20 Nov 2022 601st aeonsablaze 708 89 16ms 22 Nov 2022 601st buddyw 708 89 16ms 9 Mar 2023 601st VV1Git 708 89 19ms 28 Mar 2023 601st dranjohn 708 89 20ms 17 Sep 2023 601st ArenaGrenade 708 89 24ms 19 Feb 2024 601st NanduBC 708 89 21ms 6 Sep 2024 601st TheAtrossian 708 89 20ms 5 Jan 2025 601st KimJua41 708 89 19ms 4 May 2025 601st Upload-and-View 🇺🇦 708 89 16ms 20 Aug 2025 612th StoverGitHub 700 90 22ms 16 Jun 2022 612th jamespeilunli 700 90 26ms 4 Jul 2022 612th TrentGlimp 700 90 19ms 3 Sep 2022 612th Ugoran 700 90 18ms 19 Nov 2022 612th PATTRIM 700 90 17ms 5 Jan 2023 612th charliegaming 700 90 18ms 3 Oct 2023 612th lhulinsky 700 90 21ms 22 Oct 2024 612th bthalheim 700 90 23ms 6 Dec 2024 612th nooby31415 700 90 19ms 18 Apr 2025 612th SinArieh 700 90 23ms 4 May 2025 612th islptng 700 90 22ms 7 Jul 2025 612th Mr-McChicken 700 90 16ms 4 Oct 2025 612th NoneTheFewer 700 90 18ms 4 Dec 2025 625th AbelPelser 692 91 20ms 3 Jul 2022 625th Seis 692 91 18ms 9 Dec 2022 625th r-i-c-e 692 91 19ms 9 Jul 2023 625th joshcors 692 91 16ms 30 Jun 2024 625th resoNathan 692 91 16ms 9 Jul 2024 625th jameswmccarty 692 91 21ms 24 Sep 2024 625th hamilton-bonds 692 91 17ms 12 Nov 2024 625th Wonamm 692 91 26ms 14 Feb 2025 633rd TimLeffke 685 92 22ms 17 Aug 2022 633rd Rythoka 685 92 14ms 17 Oct 2022 633rd UriyaBA 685 92 16ms 19 Mar 2023 633rd VladislavGitter 🇪🇸 685 92 18ms 14 Nov 2023 633rd ridingqwerty 🇺🇸 685 92 17ms 22 Dec 2023 633rd Thonoton 685 92 18ms 1 Feb 2024 633rd OCNeve 685 92 19ms 17 Jun 2024 633rd themoonisacheese 685 92 22ms 25 Feb 2025 First Prev 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