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 631st Nathan-Masala 708 89 22ms 21 hours ago 642nd StoverGitHub 700 90 20ms 16 Jun 2022 642nd jamespeilunli 700 90 23ms 4 Jul 2022 642nd TrentGlimp 700 90 19ms 3 Sep 2022 642nd Ugoran 700 90 20ms 19 Nov 2022 642nd PATTRIM 700 90 17ms 5 Jan 2023 642nd charliegaming 700 90 19ms 3 Oct 2023 642nd lhulinsky 700 90 20ms 22 Oct 2024 642nd bthalheim 700 90 21ms 6 Dec 2024 642nd nooby31415 700 90 19ms 18 Apr 2025 642nd SinArieh 700 90 25ms 4 May 2025 642nd islptng 700 90 23ms 7 Jul 2025 642nd Mr-McChicken 700 90 17ms 4 Oct 2025 642nd NoneTheFewer 700 90 18ms 4 Dec 2025 655th AbelPelser 692 91 22ms 3 Jul 2022 655th Seis 692 91 19ms 9 Dec 2022 655th r-i-c-e 692 91 20ms 9 Jul 2023 655th joshcors 692 91 17ms 30 Jun 2024 655th resoNathan 692 91 16ms 9 Jul 2024 655th jameswmccarty 692 91 20ms 24 Sep 2024 655th hamilton-bonds 692 91 17ms 12 Nov 2024 655th Wonamm 692 91 28ms 14 Feb 2025 663rd TimLeffke 685 92 22ms 17 Aug 2022 663rd Rythoka 685 92 15ms 17 Oct 2022 663rd UriyaBA 685 92 17ms 19 Mar 2023 663rd VladislavGitter 🇪🇸 685 92 19ms 14 Nov 2023 663rd ridingqwerty 🇺🇸 685 92 16ms 22 Dec 2023 663rd Thonoton 685 92 19ms 1 Feb 2024 663rd OCNeve 685 92 20ms 17 Jun 2024 663rd themoonisacheese 685 92 24ms 25 Feb 2025 663rd BabySharkHi 685 92 22ms 22 Apr 2025 663rd arjunarya1 685 92 16ms 28 Aug 2025 663rd TJK-S 685 92 19ms 10 Oct 2025 674th Bananapants22 677 93 26ms 4 Sep 2022 674th jaxmattfair 🇺🇸 677 93 19ms 10 Jan 2023 674th cingulataluke 677 93 20ms 27 Aug 2023 674th fenix-bear 677 93 20ms 18 Nov 2023 674th epic-programmer-guy 677 93 22ms 22 Dec 2023 674th brimstonetrader 677 93 24ms 18 Nov 2024 674th HunterC14 677 93 26ms 10 Feb 2026 681st atazzam 🇺🇸 670 94 17ms 18 May 2022 681st rohangpta 670 94 17ms 8 Aug 2022 681st shinylego 670 94 19ms 14 Sep 2022 681st sgaltair 670 94 19ms 4 Nov 2022 681st TotoAJ 670 94 20ms 15 Dec 2023 681st Gusic06 670 94 19ms 6 May 2024 681st kyleyarwood 670 94 21ms 6 Oct 2024 681st jj0786-cell 670 94 20ms 1 Apr 2025 681st griffinschreiber 670 94 20ms 1 Apr 2025 681st o800 670 94 19ms 17 Nov 2025 691st felixcroc 663 95 19ms 30 Mar 2023 691st Pyro569 663 95 18ms 4 Jul 2023 691st rm-rf-innocence 663 95 20ms 19 Dec 2023 691st Bit125 663 95 19ms 30 Jan 2024 691st aalec 663 95 21ms 25 Apr 2024 691st strogor 663 95 20ms 13 Jun 2025 691st cthierfelder 🇲🇨 663 95 20ms 17 Jul 2025 691st ThomasDelepine 663 95 21ms 29 Oct 2025 691st professor-l 663 95 16ms 7 days ago 700th karhuthebear 656 96 23ms 9 May 2022 700th qwjhvbxi 656 96 21ms 6 Feb 2024 700th alfonsoalves 656 96 20ms 21 Jul 2024 700th jeff-re 656 96 14ms 1 Apr 2025 704th a-penton 649 97 17ms 22 Sep 2022 704th jrbud 649 97 19ms 6 Jan 2024 704th befoster 649 97 22ms 22 Feb 2024 704th joshua-el-samalouti 🇩🇪 649 97 19ms 26 May 2024 704th luca1339 649 97 20ms 10 Jun 2024 709th lukemalek 643 98 14ms 10 Oct 2022 709th UltimateGuy0987 643 98 19ms 14 Oct 2022 709th TheLazySquid 643 98 21ms 20 Dec 2022 709th StronkCheese 🇺🇸 643 98 20ms 13 Mar 2023 709th Anthony-Williams-06 643 98 27ms 17 Oct 2023 709th abcdhhhh 643 98 15ms 27 Aug 2024 709th OSYCh314 🇦🇺 643 98 26ms 16 Nov 2024 709th cole-wilson 643 98 19ms 9 Dec 2024 709th Akilles1 643 98 18ms 15 May 2025 709th Hyperoplex145 643 98 21ms 11 Nov 2025 719th 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