The Calendar hole will go live in approximately 5 days. Why not try and solve it ahead of time?
Collatz in all languages 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 559th Shanethegamer 🇺🇸 886 71 90ms 16 May 2023 559th sean-niemann 🇺🇸 886 71 89ms 12 Jul 2024 563rd Shanethegamer 🇺🇸 886 72 90ms 8 May 2025 563rd edsrzf 🇳🇿 886 72 103ms 4 Jul 2025 563rd Yewzir 🇧🇪 886 72 92ms 20 Nov 2025 566th DialFrost 🇸🇬 886 95 29ms 10 Dec 2024 567th canissimia 🇦🇶 886 110 2,640ms 20 Feb 2023 568th GrayJoKing 🇦🇺 885 77 76ms 13 Sep 2024 569th Steffan153 🇫🇮 884 52 7ms 31 Dec 2022 570th albanian-laundromat 884 94 415ms 24 Sep 2025 570th jkelly467 884 94 544ms 23 Oct 2025 570th HumanoidCPU 884 94 397ms 8 Nov 2025 573rd DialFrost 🇸🇬 883 76 81ms 17 Mar 2025 574th stefangimmillaro 882 53 40ms 2 Oct 2022 574th Haksell 🇦🇶 882 53 40ms 22 Feb 2023 576th GrayJoKing 🇦🇺 882 70 3ms 6 May 2022 576th ovs-code 🇩🇪 882 70 2ms 8 Oct 2023 576th 09cf 882 70 2ms 8 Oct 2023 576th saito-ta 🇯🇵 882 70 2ms 21 Dec 2023 576th sean-niemann 🇺🇸 882 70 2ms 10 Jul 2024 576th KasperKivimaeki 🇫🇮 882 70 6ms 8 Aug 2025 582nd primo-ppcg 🇹🇭 882 85 39ms 14 Jan 2025 582nd MeWhenI 🇻🇦 882 85 41ms 21 Apr 2025 584th SiestaGuru 882 88 326ms 9 Jan 2023 584th rifatx 882 88 322ms 5 Jul 2024 584th kmathis22 882 88 346ms 25 Sep 2025 584th arcpolaris 882 88 371ms 8 Nov 2025 588th primo-ppcg 🇹🇭 881 52 219ms 5 May 2022 588th dvargas46 🇺🇸 881 52 91ms 22 Dec 2022 590th DialFrost 🇸🇬 881 56 863ms 1 Sep 2025 591st ovs-code 🇩🇪 881 89 438ms 24 Jul 2024 591st jipsong 🇩🇪 881 89 467ms 7 Apr 2025 591st DialFrost 🇸🇬 881 89 394ms 2 days ago 594th nipzu 881 94 116ms 17 May 2022 594th Natanaelel 🇸🇪 881 94 125ms 17 Jun 2022 594th nkoppel 881 94 120ms 19 Oct 2022 594th ovs-code 🇩🇪 881 94 120ms 21 Jun 2023 594th mousetail 🇳🇱 881 94 124ms 12 Jan 2024 599th snoozingnewt 🇨🇦 881 95 109ms 22 days ago 600th Irratix 🇳🇱 881 96 57ms 4 May 2022 600th MeWhenI 🇻🇦 881 96 58ms 1 Jun 2022 600th janbehrens 🇩🇪 881 96 57ms 21 Apr 2023 600th Shanethegamer 🇺🇸 881 96 69ms 15 May 2023 600th Yewzir 🇧🇪 881 96 67ms 11 Nov 2023 600th MateuszPietrzak 🇵🇱 881 96 60ms 18 Nov 2023 600th kkoenig 881 96 59ms 21 Dec 2023 600th BlankSpruce 881 96 60ms 20 Aug 2024 600th fuzzylojik-golf 🇺🇸 881 96 86ms 14 Jun 2025 609th m-tkach 🇺🇦 881 112 118ms 22 Jun 2025 610th sisyphus-ppcg 🇦🇺 880 40 389ms 31 Jan 2023 610th sean-niemann 🇺🇸 880 40 399ms 8 Mar 2025 612th ovs-code 🇩🇪 880 73 340ms 22 Jul 2023 613th sean-niemann 🇺🇸 880 108 274ms 25 May 2024 613th GolfingSuccess 🇬🇷 880 108 273ms 6 Sep 2025 615th GrayJoKing 🇦🇺 879 72 426ms 31 May 2022 615th Shanethegamer 🇺🇸 879 72 411ms 1 Jun 2022 615th Steffan153 🇫🇮 879 72 413ms 10 Dec 2022 618th steffan-polygolf 879 74 136ms 14 Feb 2024 618th prestosilver 🇺🇸 879 74 124ms 8 days ago 620th Shanethegamer 🇺🇸 879 81 17ms 19 Dec 2023 620th emgordon154 879 81 31ms 29 Jul 2025 622nd primo-ppcg 🇹🇭 878 193 107ms 14 Aug 2025 623rd Shanethegamer 🇺🇸 877 142 511ms 27 Mar 2025 623rd DialFrost 🇸🇬 877 142 490ms 28 Mar 2025 623rd emgordon154 877 142 395ms 10 Apr 2025 623rd GolfingSuccess 🇬🇷 877 142 463ms 20 days ago 627th mousetail 🇳🇱 876 40 66ms 29 Aug 2025 628th GrayJoKing 🇦🇺 876 84 37ms 19 Jun 2022 628th primo-ppcg 🇹🇭 876 84 36ms 29 Jun 2022 630th Shanethegamer 🇺🇸 875 51 426ms 15 May 2023 631st JayXon 🇺🇸 875 157 1,772ms 14 Sep 2025 632nd rucin93 🇵🇱 874 57 136ms 4 Aug 2024 632nd dokutan 874 57 129ms 9 Aug 2024 634th c0d3-4-F00d 🇩🇪 874 61 10ms 6 May 2022 634th jackkav 874 61 10ms 26 Jun 2022 634th TechNolaByte 874 61 10ms 6 Jul 2022 634th Heathcorp 🇦🇺 874 61 9ms 17 Jul 2022 634th C0de5mith 🇺🇸 874 61 11ms 3 Aug 2022 634th sebipopa 🇷🇴 874 61 10ms 18 Aug 2022 634th moikaturns 🇬🇧 874 61 9ms 25 Sep 2022 First Prev 561–640 of 3,482 Next Last