Collatz in Java in chars. 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 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 Calendar 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 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 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 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 Calendar 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 Chars Time Submitted 1st JayXon 🇺🇸 1,000 88 540ms 24 Sep 2025 1st Lydxn 🇨🇦 1,000 88 340ms 7 hours ago 3rd DialFrost 🇸🇬 989 89 402ms 24 Sep 2025 3rd ovs-code 🇩🇪 989 89 448ms 24 Sep 2025 3rd dokutan 989 89 417ms 24 Sep 2025 3rd sean-niemann 🇺🇸 989 89 456ms 24 Sep 2025 3rd Shanethegamer 🇺🇸 989 89 438ms 25 Sep 2025 3rd nwellnhof 🇩🇪 989 89 429ms 25 Sep 2025 3rd m-tkach 🇺🇦 989 89 415ms 25 Sep 2025 3rd namelessiw 989 89 456ms 2 Oct 2025 3rd Yewzir 🇧🇪 989 89 695ms 2 Oct 2025 3rd Yax42 🇫🇷 989 89 422ms 4 Oct 2025 3rd stefangimmillaro 989 89 428ms 6 Oct 2025 3rd CaedenHarper 🇨🇦 989 89 433ms 9 Oct 2025 3rd Jacob385 989 89 452ms 27 Oct 2025 3rd MeWhenI 🇻🇦 989 89 416ms 7 Nov 2025 3rd ethanlally 989 89 433ms 10 Nov 2025 3rd snoozingnewt 🇨🇦 989 89 394ms 18 days ago 3rd ScottHamper 989 89 436ms 12 days ago 3rd KasperKivimaeki 🇫🇮 989 89 368ms 11 days ago 21st h3ra993huskp 🇯🇵 978 90 440ms 12 days ago 22nd kmathis22 967 91 548ms 22 days ago 23rd albanian-laundromat 936 94 415ms 24 Sep 2025 23rd jkelly467 936 94 544ms 23 Oct 2025 23rd HumanoidCPU 936 94 397ms 8 Nov 2025 26th 123mjb 917 96 356ms 22 days ago 26th noescareno 917 96 406ms 20 days ago 28th Liibe 907 97 391ms 25 Sep 2025 28th Schmitt-Very-Cool 907 97 435ms 26 Sep 2025 30th beardotpdf 889 99 346ms 2 hours ago 31st CarterStroik 880 100 415ms 13 Nov 2025 32nd tigerdan2 🇩🇪 822 107 420ms 12 days ago 33rd Irratix 🇳🇱 698 126 398ms 4 May 2022 33rd janbehrens 🇩🇪 698 126 370ms 4 May 2022 33rd shellbertt 🇨🇦 698 126 371ms 4 May 2022 33rd inventshah 698 126 390ms 4 May 2022 33rd 5quiwyrm 698 126 374ms 4 Sep 2022 33rd KrausRaus 🇺🇸 698 126 379ms 9 Sep 2022 33rd Betuaredead 698 126 375ms 5 Jan 2023 33rd annaproxy 698 126 392ms 7 Jan 2023 33rd eMGeeneer 698 126 457ms 15 Jun 2024 33rd mrondon8 698 126 383ms 2 Dec 2024 33rd plastic-bottle 698 126 424ms 27 Aug 2025 44th Luca2812 693 127 397ms 12 Dec 2022 44th Apataras 693 127 391ms 16 Jul 2025 46th bac0id 688 128 418ms 29 Jun 2024 47th cbrt-x 682 129 389ms 6 May 2022 47th FlorianCassayre 🇫🇷 682 129 396ms 20 Sep 2022 47th piano-miles 682 129 415ms 8 Feb 2023 47th Widgitty 682 129 385ms 29 May 2023 47th lukashert 682 129 390ms 7 Jun 2023 47th yoshykai 682 129 372ms 27 Mar 2025 53rd bwat2 677 130 420ms 5 May 2022 54th SiestaGuru 672 131 385ms 9 Jan 2023 55th c0d3-4-F00d 🇩🇪 667 132 381ms 6 May 2022 55th madeforlosers 667 132 403ms 26 Oct 2023 55th Blockyheadman 667 132 383ms 1 Nov 2023 55th SpiritAxolotl 🇺🇸 667 132 396ms 20 Mar 2024 59th ravnskjaer 🇩🇰 662 133 374ms 11 Sep 2024 60th althryenix 657 134 382ms 25 Jul 2022 60th MrGagnonHPS 657 134 397ms 1 Nov 2023 62nd lukehewittvandy 652 135 403ms 18 Jul 2022 62nd OriEy 652 135 382ms 27 Apr 2023 62nd Maximizer02 652 135 405ms 8 Jun 2024 62nd 0dyse 652 135 368ms 23 Apr 2025 66th crizin 🇰🇷 647 136 378ms 9 Sep 2023 66th TheZwierzLF 🇵🇱 647 136 412ms 2 Jun 2025 68th eshilo-draper 642 137 394ms 4 Sep 2022 69th azka1368 638 138 387ms 23 Nov 2023 70th Smetalo 633 139 387ms 25 Aug 2022 70th ToxicP1e 633 139 380ms 2 Mar 2023 72nd yashima 624 141 369ms 19 Oct 2024 72nd matas132 624 141 369ms 16 Sep 2025 72nd katss2 624 141 389ms 19 Sep 2025 75th msbranicky 607 145 397ms 9 Jan 2024 1–75 of 109 Next Last