The Calendar hole will go live in approximately 5 days. Why not try and solve it ahead of time?
Happy Numbers (Long) in all languages 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 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 Bytes Time Submitted 721st elgan65536 810 123 124ms 5 Mar 2024 722nd NewDefectus 🇮🇱 809 54 59ms 15 Dec 2021 722nd LostSyntax21 🇬🇧 809 54 146ms 8 Jan 2025 724th MeWhenI 🇻🇦 809 90 2ms 10 Oct 2023 725th MeWhenI 🇻🇦 809 93 17ms 2 Oct 2022 726th Shanethegamer 🇺🇸 809 100 12ms 10 Sep 2022 726th albanian-laundromat 809 100 11ms 2 days ago 728th Yewzir 🇧🇪 808 83 485ms 15 Jan 2024 729th AlephSquirrel 807 89 14ms 20 Apr 2023 730th frankgraziano 806 232 37ms 31 Oct 2025 731st GrayJoKing 🇦🇺 804 72 139ms 3 Aug 2024 732nd scpchicken 🇵🇼 804 87 222ms 12 Jan 2022 732nd JuliaSzulc 804 87 19ms 16 Mar 2022 732nd LHuitre 804 87 19ms 5 Jun 2022 732nd betaveros 804 87 409ms 1 Jan 2023 732nd croc54 804 87 228ms 8 Jan 2025 732nd LostSyntax21 🇬🇧 804 87 207ms 8 Mar 2025 732nd andrewjc2000 804 87 19ms 11 Aug 2025 739th Steffan153 🇫🇮 804 95 22ms 21 Feb 2023 739th Waffle3z 804 95 2ms 3 hours ago 741st jared-hughes 804 124 127ms 10 Nov 2022 741st Re-Adventures 🇮🇳 804 124 123ms 22 Jun 2023 743rd snoozingnewt 🇨🇦 804 148 272ms 4 Feb 2024 744th c0d3-4-F00d 🇩🇪 803 74 11ms 5 Jan 2022 744th Maznek 803 74 11ms 19 Jun 2023 744th thisishowmymindworks 🇳🇴 803 74 105ms 9 Jun 2024 744th snoozingnewt 🇨🇦 803 74 11ms 1 Sep 2024 744th blaztoma 🇱🇹 803 74 11ms 23 Nov 2025 749th tailorspy 803 118 67ms 22 Sep 2024 749th dokutan 803 118 63ms 6 Nov 2025 751st Natanaelel 🇸🇪 802 72 71ms 26 Sep 2023 752nd brimstonetrader 802 85 122ms 26 Jan 2024 753rd inventshah 801 158 415ms 8 Sep 2022 754th primo-ppcg 🇹🇭 800 61 389ms 9 Feb 2022 755th msbranicky 800 91 3ms 11 Oct 2023 756th DialFrost 🇸🇬 799 63 290ms 21 Jan 2025 757th Alessandro-Balconi 🇮🇹 799 77 86ms 14 Jul 2023 758th DialFrost 🇸🇬 799 149 283ms 28 Jan 2023 758th LostSyntax21 🇬🇧 799 149 294ms 8 Jan 2025 760th MeWhenI 🇻🇦 798 100 112ms 15 Oct 2022 761st Shanethegamer 🇺🇸 798 105 15ms 17 Dec 2023 762nd Shanethegamer 🇺🇸 797 60 107ms 19 Sep 2021 762nd adoxography 797 60 38ms 18 Dec 2021 762nd jared-hughes 797 60 45ms 9 Sep 2022 762nd Lv0Sys 🇵🇱 797 60 62ms 21 days ago 766th MeWhenI 🇻🇦 797 110 40ms 17 Feb 2023 767th namelessiw 797 118 394ms 6 Oct 2025 768th Herbert00709 🇵🇱 797 119 64ms 4 Sep 2024 769th Waffle3z 795 88 20ms 19 Sep 2021 769th TaserTheFox 🇺🇸 795 88 20ms 28 Feb 2023 769th tobyLovick 795 88 20ms 12 Dec 2023 769th Dataen 795 88 299ms 12 Jan 2024 769th yuchuehw 795 88 20ms 28 Jan 2024 769th Masttest 795 88 19ms 13 Feb 2024 769th Flekay 🇩🇪 795 88 20ms 11 Jul 2025 769th dirckvdende 795 88 400ms 2 Aug 2025 777th sisyphus-ppcg 🇦🇺 795 96 15ms 7 Apr 2022 777th DialFrost 🇸🇬 795 96 27ms 31 Oct 2024 777th sean-niemann 🇺🇸 795 96 21ms 9 Apr 2025 777th edsrzf 🇳🇿 795 96 12ms 26 Jul 2025 781st mousetail 🇳🇱 794 55 32ms 15 Jan 2024 782nd NewDefectus 🇮🇱 794 88 2ms 16 Dec 2021 783rd Shanethegamer 🇺🇸 794 97 363ms 20 Jun 2022 783rd billings7 🇬🇧 794 97 373ms 21 May 2024 785th MeWhenI 🇻🇦 793 73 133ms 3 Aug 2024 786th janbehrens 🇩🇪 790 120 61ms 20 Nov 2022 786th oceko 790 120 60ms 19 Feb 2024 788th albanian-laundromat 789 85 464ms 22 days ago 789th steffan-polygolf 789 103 120ms 19 Feb 2024 790th gnuvince 788 33 36ms 2 Aug 2024 790th codereport 🇨🇦 788 33 6ms 21 Apr 2025 792nd Shanethegamer 🇺🇸 788 61 418ms 9 Mar 2023 793rd NickTheEASDude 🇺🇸 787 97 18ms 9 May 2024 794th MeWhenI 🇻🇦 787 105 457ms 17 Aug 2023 795th TimHuisman1703 786 89 248ms 7 Jan 2022 795th Anonymousellama21 786 89 2,475ms 27 Jun 2022 795th yourlefthandman 786 89 277ms 17 Aug 2023 795th msbranicky 786 89 271ms 5 Oct 2023 795th luyckxrobbe 786 89 19ms 20 Nov 2023 795th madex 🇩🇪 786 89 13ms 13 Jun 2024 First Prev 721–800 of 2,046 Next Last