The Calendar hole will go live in approximately 7 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 720th LostSyntax21 🇬🇧 809 54 146ms 8 Jan 2025 722nd MeWhenI 🇻🇦 809 90 2ms 10 Oct 2023 723rd MeWhenI 🇻🇦 809 93 17ms 2 Oct 2022 724th Shanethegamer 🇺🇸 809 100 12ms 10 Sep 2022 724th albanian-laundromat 809 100 11ms 10 hours ago 726th Yewzir 🇧🇪 808 83 485ms 15 Jan 2024 727th AlephSquirrel 807 89 14ms 20 Apr 2023 728th frankgraziano 806 232 38ms 31 Oct 2025 729th GrayJoKing 🇦🇺 804 72 139ms 3 Aug 2024 730th scpchicken 🇵🇼 804 87 222ms 12 Jan 2022 730th JuliaSzulc 804 87 19ms 16 Mar 2022 730th LHuitre 804 87 19ms 5 Jun 2022 730th betaveros 804 87 409ms 1 Jan 2023 730th croc54 804 87 228ms 8 Jan 2025 730th LostSyntax21 🇬🇧 804 87 207ms 8 Mar 2025 730th andrewjc2000 804 87 19ms 11 Aug 2025 737th jared-hughes 804 124 127ms 10 Nov 2022 737th Re-Adventures 🇮🇳 804 124 123ms 22 Jun 2023 739th snoozingnewt 🇨🇦 804 148 272ms 4 Feb 2024 740th c0d3-4-F00d 🇩🇪 803 74 13ms 5 Jan 2022 740th Maznek 803 74 11ms 19 Jun 2023 740th thisishowmymindworks 🇳🇴 803 74 105ms 9 Jun 2024 740th snoozingnewt 🇨🇦 803 74 11ms 1 Sep 2024 740th blaztoma 🇱🇹 803 74 11ms 23 Nov 2025 745th Steffan153 🇫🇮 803 95 38ms 21 Feb 2023 746th tailorspy 803 118 67ms 22 Sep 2024 746th dokutan 803 118 63ms 6 Nov 2025 748th Natanaelel 🇸🇪 802 72 75ms 26 Sep 2023 749th brimstonetrader 802 85 122ms 26 Jan 2024 750th inventshah 801 158 415ms 8 Sep 2022 751st primo-ppcg 🇹🇭 800 61 389ms 9 Feb 2022 752nd msbranicky 800 91 3ms 11 Oct 2023 753rd DialFrost 🇸🇬 799 63 319ms 21 Jan 2025 754th Alessandro-Balconi 🇮🇹 799 77 86ms 14 Jul 2023 755th DialFrost 🇸🇬 799 149 283ms 28 Jan 2023 755th LostSyntax21 🇬🇧 799 149 294ms 8 Jan 2025 757th MeWhenI 🇻🇦 798 100 112ms 15 Oct 2022 758th Shanethegamer 🇺🇸 798 105 15ms 17 Dec 2023 759th Shanethegamer 🇺🇸 797 60 101ms 19 Sep 2021 759th adoxography 797 60 35ms 18 Dec 2021 759th jared-hughes 797 60 38ms 9 Sep 2022 759th Lv0Sys 🇵🇱 797 60 35ms 18 days ago 763rd MeWhenI 🇻🇦 797 110 40ms 17 Feb 2023 764th namelessiw 797 118 394ms 6 Oct 2025 765th Herbert00709 🇵🇱 796 119 64ms 4 Sep 2024 766th Waffle3z 795 88 20ms 19 Sep 2021 766th TaserTheFox 🇺🇸 795 88 20ms 28 Feb 2023 766th tobyLovick 795 88 20ms 12 Dec 2023 766th Dataen 795 88 299ms 12 Jan 2024 766th yuchuehw 795 88 20ms 28 Jan 2024 766th Masttest 795 88 19ms 13 Feb 2024 766th Flekay 🇩🇪 795 88 20ms 11 Jul 2025 766th dirckvdende 795 88 400ms 2 Aug 2025 774th sisyphus-ppcg 🇦🇺 795 96 18ms 7 Apr 2022 774th DialFrost 🇸🇬 795 96 31ms 31 Oct 2024 774th sean-niemann 🇺🇸 795 96 22ms 9 Apr 2025 774th edsrzf 🇳🇿 795 96 12ms 26 Jul 2025 778th mousetail 🇳🇱 794 55 32ms 15 Jan 2024 779th NewDefectus 🇮🇱 794 88 2ms 16 Dec 2021 780th Shanethegamer 🇺🇸 794 97 363ms 20 Jun 2022 780th billings7 🇬🇧 794 97 373ms 21 May 2024 782nd MeWhenI 🇻🇦 793 73 133ms 3 Aug 2024 783rd janbehrens 🇩🇪 790 120 61ms 20 Nov 2022 783rd oceko 790 120 60ms 19 Feb 2024 785th albanian-laundromat 789 85 464ms 19 days ago 786th steffan-polygolf 789 103 120ms 19 Feb 2024 787th gnuvince 788 33 36ms 2 Aug 2024 787th codereport 🇨🇦 788 33 6ms 21 Apr 2025 789th Shanethegamer 🇺🇸 788 61 418ms 9 Mar 2023 790th MeWhenI 🇻🇦 787 105 457ms 17 Aug 2023 791st TimHuisman1703 786 89 248ms 7 Jan 2022 791st Anonymousellama21 786 89 2,475ms 27 Jun 2022 791st yourlefthandman 786 89 277ms 17 Aug 2023 791st msbranicky 786 89 271ms 5 Oct 2023 791st luyckxrobbe 786 89 19ms 20 Nov 2023 791st madex 🇩🇪 786 89 13ms 13 Jun 2024 791st rollershutter 786 89 290ms 2 Jul 2024 791st Mabeloid 🇳🇴 786 89 12ms 18 Sep 2024 791st jatloe 786 89 321ms 27 Sep 2024 791st JOrE20 🇺🇸 786 89 19ms 19 days ago First Prev 721–800 of 2,041 Next Last