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 641st StoverGitHub 700 90 20ms 16 Jun 2022 641st jamespeilunli 700 90 23ms 4 Jul 2022 641st TrentGlimp 700 90 19ms 3 Sep 2022 641st Ugoran 700 90 20ms 19 Nov 2022 641st PATTRIM 700 90 17ms 5 Jan 2023 641st charliegaming 700 90 19ms 3 Oct 2023 641st lhulinsky 700 90 20ms 22 Oct 2024 641st bthalheim 700 90 21ms 6 Dec 2024 641st nooby31415 700 90 19ms 18 Apr 2025 641st SinArieh 700 90 25ms 4 May 2025 641st islptng 700 90 23ms 7 Jul 2025 641st Mr-McChicken 700 90 17ms 4 Oct 2025 641st NoneTheFewer 700 90 18ms 4 Dec 2025 654th AbelPelser 692 91 22ms 3 Jul 2022 654th Seis 692 91 19ms 9 Dec 2022 654th r-i-c-e 692 91 20ms 9 Jul 2023 654th joshcors 692 91 17ms 30 Jun 2024 654th resoNathan 692 91 16ms 9 Jul 2024 654th jameswmccarty 692 91 20ms 24 Sep 2024 654th hamilton-bonds 692 91 17ms 12 Nov 2024 654th Wonamm 692 91 28ms 14 Feb 2025 662nd TimLeffke 685 92 22ms 17 Aug 2022 662nd Rythoka 685 92 15ms 17 Oct 2022 662nd UriyaBA 685 92 17ms 19 Mar 2023 662nd VladislavGitter 🇪🇸 685 92 19ms 14 Nov 2023 662nd ridingqwerty 🇺🇸 685 92 16ms 22 Dec 2023 662nd Thonoton 685 92 19ms 1 Feb 2024 662nd OCNeve 685 92 20ms 17 Jun 2024 662nd themoonisacheese 685 92 24ms 25 Feb 2025 662nd BabySharkHi 685 92 22ms 22 Apr 2025 662nd arjunarya1 685 92 16ms 28 Aug 2025 662nd TJK-S 685 92 19ms 10 Oct 2025 673rd Bananapants22 677 93 26ms 4 Sep 2022 673rd jaxmattfair 🇺🇸 677 93 19ms 10 Jan 2023 673rd cingulataluke 677 93 20ms 27 Aug 2023 673rd fenix-bear 677 93 20ms 18 Nov 2023 673rd epic-programmer-guy 677 93 22ms 22 Dec 2023 673rd brimstonetrader 677 93 24ms 18 Nov 2024 673rd HunterC14 677 93 26ms 10 Feb 2026 680th atazzam 🇺🇸 670 94 17ms 18 May 2022 680th rohangpta 670 94 17ms 8 Aug 2022 680th shinylego 670 94 19ms 14 Sep 2022 680th sgaltair 670 94 19ms 4 Nov 2022 680th TotoAJ 670 94 20ms 15 Dec 2023 680th Gusic06 670 94 19ms 6 May 2024 680th kyleyarwood 670 94 21ms 6 Oct 2024 680th jj0786-cell 670 94 20ms 1 Apr 2025 680th griffinschreiber 670 94 20ms 1 Apr 2025 680th o800 670 94 19ms 17 Nov 2025 690th felixcroc 663 95 19ms 30 Mar 2023 690th Pyro569 663 95 18ms 4 Jul 2023 690th rm-rf-innocence 663 95 20ms 19 Dec 2023 690th Bit125 663 95 19ms 30 Jan 2024 690th aalec 663 95 21ms 25 Apr 2024 690th strogor 663 95 20ms 13 Jun 2025 690th cthierfelder 🇲🇨 663 95 20ms 17 Jul 2025 690th ThomasDelepine 663 95 21ms 29 Oct 2025 690th professor-l 663 95 16ms 6 days ago 699th karhuthebear 656 96 23ms 9 May 2022 699th qwjhvbxi 656 96 21ms 6 Feb 2024 699th alfonsoalves 656 96 20ms 21 Jul 2024 699th jeff-re 656 96 14ms 1 Apr 2025 703rd a-penton 649 97 17ms 22 Sep 2022 703rd jrbud 649 97 19ms 6 Jan 2024 703rd befoster 649 97 22ms 22 Feb 2024 703rd joshua-el-samalouti 🇩🇪 649 97 19ms 26 May 2024 703rd luca1339 649 97 20ms 10 Jun 2024 708th lukemalek 643 98 14ms 10 Oct 2022 708th UltimateGuy0987 643 98 19ms 14 Oct 2022 708th TheLazySquid 643 98 21ms 20 Dec 2022 708th StronkCheese 🇺🇸 643 98 20ms 13 Mar 2023 708th Anthony-Williams-06 643 98 27ms 17 Oct 2023 708th abcdhhhh 643 98 15ms 27 Aug 2024 708th OSYCh314 🇦🇺 643 98 26ms 16 Nov 2024 708th cole-wilson 643 98 19ms 9 Dec 2024 708th Akilles1 643 98 18ms 15 May 2025 708th Hyperoplex145 643 98 21ms 11 Nov 2025 718th LukeRichardson-dev 636 99 15ms 12 May 2022 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