Collatz in Python in bytes. Cheevos Holes Recent Holes Langs Medals Misc 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 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 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 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 Calendar Connect Four CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers Minesweeper NFA Simulator Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Turtle Tutorial All Languages ><> Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir 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 Arturo Befunge BQN CJam CoffeeScript Egel Erlang 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 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 Arturo Befunge BQN CJam CoffeeScript Egel Erlang 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 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 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 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 Calendar Connect Four CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers Minesweeper NFA Simulator Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Turtle Tutorial # Golfer Points Bytes Time Submitted 194th Matter1024 🇮🇳 919 74 20ms 11 Sep 2025 194th pauljoohyunkim 919 74 27 days ago 194th joll05 🇸🇪 919 74 25ms 21 days ago 194th retrohun 919 74 27ms 19 days ago 194th solisolu 919 74 21ms 17 days ago 194th Code-Coder-coder 919 74 19ms 9 days ago 307th martinnorling 🇸🇪 907 75 24ms 5 May 2022 307th Trunksistor 🇫🇷 907 75 23ms 9 May 2022 307th bbakersmith 907 75 30ms 28 Jun 2022 307th bsoyka 🇺🇸 907 75 20ms 16 Jul 2022 307th P-Quentin 🇫🇷 907 75 18ms 3 Aug 2022 307th julienlamoureux78 907 75 20ms 12 Aug 2022 307th dzshn 907 75 29ms 16 Aug 2022 307th NerdyMcNerd42 907 75 19ms 20 Aug 2022 307th destofr 907 75 20ms 25 Aug 2022 307th vishwathg 907 75 47ms 10 Oct 2022 307th nkoppel 907 75 19ms 19 Oct 2022 307th AZ9tumas 907 75 21ms 23 Oct 2022 307th EthanGrant1 907 75 33ms 7 Nov 2022 307th Omega65536 🇩🇪 907 75 18ms 24 Nov 2022 307th b10011 🇫🇮 907 75 27ms 3 Jan 2023 307th 4ndyJ 🇬🇧 907 75 23ms 3 Jan 2023 307th randolchance 907 75 19ms 8 Jan 2023 307th LeeCamp 907 75 19ms 12 Jan 2023 307th hellwue 907 75 20ms 15 Feb 2023 307th nandanjp 907 75 20ms 29 Mar 2023 307th kaptsanovb 907 75 35ms 20 Apr 2023 307th galloj 🇨🇿 907 75 20ms 20 May 2023 307th jhu04 907 75 21ms 23 Jun 2023 307th HelloYuiYui 907 75 20ms 1 Nov 2023 307th tobyLovick 907 75 29ms 10 Nov 2023 307th VictorStenvers 🇳🇱 907 75 30ms 13 Nov 2023 307th RZ781 907 75 29ms 19 Nov 2023 307th mikehanus 907 75 27ms 21 Nov 2023 307th 1231234md5 🇨🇳 907 75 22ms 14 Dec 2023 307th Hebelub 907 75 23ms 6 Jan 2024 307th minhtrancccp 907 75 27ms 11 Jan 2024 307th 123mjb 907 75 34ms 25 Jan 2024 307th jbjd 907 75 23ms 25 Feb 2024 307th gabe-gallegos 907 75 23ms 2 May 2024 307th kejcao 🇨🇦 907 75 26ms 11 May 2024 307th f-tucker 907 75 23ms 24 May 2024 307th Florian-Mt 907 75 19ms 22 Jul 2024 307th codingisgreatbutiamnot 907 75 24ms 9 Aug 2024 307th Terobero 907 75 32ms 23 Aug 2024 307th abhishekg999 907 75 53ms 17 Sep 2024 307th RedzGoose 🇦🇺 907 75 22ms 7 Oct 2024 307th Clay-Goodling 907 75 24ms 8 Oct 2024 307th JunkIce 907 75 24ms 5 Mar 2025 307th jiji7879 907 75 23ms 20 Jun 2025 307th faragocsaba 907 75 26ms 22 Jun 2025 307th bknower 907 75 23ms 30 Jun 2025 307th clayboll99 907 75 28ms 14 Jul 2025 307th fvla 907 75 7 days ago 355th guilhem-roy 🇫🇷 895 76 25ms 5 May 2022 355th NewDefectus 🇮🇱 895 76 22ms 6 May 2022 355th CuboidRaptor 🇨🇦 895 76 24ms 25 May 2022 355th TheSmilingTurtle 895 76 27ms 5 Jun 2022 355th Romain-1 🇫🇷 895 76 19ms 8 Jun 2022 355th jhpaques 🇫🇷 895 76 23ms 30 Jul 2022 355th chriscianfarani 895 76 22ms 10 Aug 2022 355th eshilo-draper 895 76 28ms 13 Sep 2022 355th suwat513 895 76 20ms 22 Sep 2022 355th Jaydosu 895 76 23ms 14 Nov 2022 355th tails618 895 76 28ms 2 Dec 2022 355th KevinLyvers 895 76 22ms 17 Dec 2022 355th nayakrujul 895 76 21ms 3 Jan 2023 355th CheeseCake628 🇳🇴 895 76 22ms 8 Jan 2023 355th CatsAreFluffy 895 76 25ms 18 Feb 2023 355th adamnielson42 🇺🇸 895 76 20ms 1 Mar 2023 355th Schreipfelerer 895 76 28ms 9 Apr 2023 355th hm5822 895 76 27ms 22 Apr 2023 355th celiendonze 🇨🇭 895 76 26ms 5 Jul 2023 355th brochmann 🇸🇪 895 76 22ms 13 Aug 2023 355th Command-Master 895 76 36ms 2 Oct 2023 First Prev 301–375 of 791 Next Last