The Calendar hole will go live in approximately 4 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 721st GolfingSuccess 🇬🇷 866 57 819ms 29 Aug 2025 722nd MeWhenI 🇻🇦 866 85 41ms 27 Jun 2022 722nd Shanethegamer 🇺🇸 866 85 38ms 15 May 2023 722nd albanian-laundromat 866 85 40ms 25 Aug 2025 725th 123mjb 866 96 356ms 20 Nov 2025 725th noescareno 866 96 406ms 21 Nov 2025 727th DialFrost 🇸🇬 864 64 5ms 10 Jul 2024 728th emplv 🇱🇻 864 110 296ms 5 May 2022 728th Shanethegamer 🇺🇸 864 110 261ms 21 Nov 2023 728th edsrzf 🇳🇿 864 110 258ms 28 Nov 2024 728th targrik 864 110 267ms 30 Jun 2025 732nd emgordon154 864 159 1,744ms 3 days ago 733rd deadp4nda 🇩🇪 863 90 372ms 26 Apr 2024 733rd 123mjb 863 90 339ms 23 Jun 2025 733rd michelebastione 🇮🇹 863 90 384ms 24 Aug 2025 733rd razvandmtr 🇷🇴 863 90 368ms 6 Nov 2025 737th TylerBloom 863 96 115ms 22 Mar 2024 738th Shanethegamer 🇺🇸 863 97 100ms 15 Apr 2025 738th GolfingSuccess 🇬🇷 863 97 111ms 28 Nov 2025 738th DialFrost 🇸🇬 863 97 94ms 26 days ago 741st shellbertt 🇨🇦 863 98 63ms 9 May 2022 741st iakolzin 863 98 61ms 26 May 2022 741st Betuaredead 863 98 61ms 5 Jan 2023 741st oceko 863 98 63ms 19 Feb 2024 741st dokutan 863 98 61ms 17 Mar 2024 741st cuzdav 863 98 60ms 4 May 2025 741st timhaj 🇸🇮 863 98 61ms 12 Sep 2025 741st Yax42 🇫🇷 863 98 60ms 4 Oct 2025 749th Steffan153 🇫🇮 862 82 1,287ms 23 Feb 2023 750th steffan-polygolf 861 73 87ms 23 Feb 2023 750th MWI-polygolf 861 73 83ms 6 Dec 2023 750th HumanoidCPU 861 73 81ms 7 May 2024 753rd Steffan153 🇫🇮 861 78 80ms 4 Feb 2023 754th GrayJoKing 🇦🇺 860 56 411ms 15 Jan 2024 754th AlephSquirrel 860 56 426ms 21 Jan 2024 756th Setvizan 860 62 10ms 12 Jan 2023 756th GreenBeansAgainstVeganism 860 62 10ms 13 Jan 2023 756th arctouch-cristiannevianna 860 62 10ms 3 Apr 2023 756th Corxldyphik 860 62 10ms 11 Apr 2023 756th Blockyheadman 860 62 10ms 1 Nov 2023 756th ollyspooner 860 62 10ms 22 Nov 2023 756th itserasmus 860 62 10ms 25 Jan 2024 756th Jacob385 860 62 10ms 13 Mar 2024 756th junkondo-jp 860 62 11ms 30 Jun 2024 756th ShiraJoseph 🇺🇸 860 62 9ms 1 Mar 2025 756th tomh1012 860 62 9ms 24 days ago 767th yzhs 🇩🇪 860 65 19ms 16 Jun 2022 767th rollershutter 860 65 20ms 9 Sep 2022 767th bac0id 860 65 20ms 26 Sep 2023 767th robin-scragg 860 65 23ms 8 Jun 2025 767th RaBa21 🇭🇺 860 65 29ms 11 Jul 2025 767th TransformLikeATensor 860 65 20ms 17 Oct 2025 773rd Andriamanitra 🇫🇮 860 67 144ms 26 Apr 2023 774th MeWhenI 🇻🇦 859 81 8ms 23 May 2023 775th MeWhenI 🇻🇦 859 145 526ms 28 Mar 2025 776th ulucs 858 35 9ms 8 May 2022 776th bstrat 858 35 9ms 6 Jun 2024 776th wh3n3v3r 🇨🇿 858 35 8ms 18 Nov 2024 779th JRaspass 🇬🇧 858 41 348ms 4 May 2022 779th SirBogman 🇺🇸 858 41 225ms 4 May 2022 779th Natanaelel 🇸🇪 858 41 326ms 4 May 2022 782nd 5quiwyrm 858 52 249ms 4 Sep 2022 782nd MeWhenI 🇻🇦 858 52 280ms 28 Jan 2023 782nd Feniske 🇫🇷 858 52 280ms 7 Nov 2023 782nd dcgjb 858 52 297ms 29 Jan 2024 782nd JPRuskin 🇬🇧 858 52 278ms 7 Apr 2025 782nd IISResetMe 858 52 267ms 7 Apr 2025 782nd Ripick 858 52 251ms 1 Jun 2025 789th Yewzir 🇧🇪 858 160 2,399ms 14 Nov 2025 790th jared-hughes 857 72 2ms 6 Jul 2022 790th Steffan153 🇫🇮 857 72 2ms 3 Jan 2023 790th MeWhenI 🇻🇦 857 72 3ms 7 May 2023 790th ListeriaM 857 72 2ms 22 Aug 2023 790th larcherMTT 857 72 2ms 5 Oct 2024 790th snyderek 🇺🇸 857 72 3ms 19 Feb 2025 790th 5quiwyrm 857 72 2ms 29 Jun 2025 790th TeodorDyakov 🇧🇬 857 72 3ms 8 Jul 2025 790th xiaoyiming123 857 72 2ms 12 Jul 2025 799th Liibe 857 97 391ms 25 Sep 2025 799th Schmitt-Very-Cool 857 97 435ms 26 Sep 2025 First Prev 721–800 of 3,486 Next Last