The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
Happy Numbers 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 712th MeWhenI 🇻🇦 874 148 456ms 9 Feb 2025 712th pardouin 🇫🇷 874 148 611ms 25 Feb 2025 712th albanian-laundromat 874 148 430ms 25 Jul 2025 712th snoozingnewt 🇨🇦 874 148 426ms 10 days ago 725th primo-ppcg 🇹🇭 873 77 1ms 13 Jul 2021 726th nwellnhof 🇩🇪 873 99 64ms 3 Jan 2022 726th Alex-x90 🇺🇸 873 99 53ms 20 Sep 2022 726th Steffan153 🇫🇮 873 99 81ms 28 Jan 2023 726th ovs-code 🇩🇪 873 99 70ms 3 Jun 2024 726th roupiq 🇵🇱 873 99 76ms 8 Jun 2024 726th Herbert00709 🇵🇱 873 99 67ms 8 Jun 2024 726th sean-niemann 🇺🇸 873 99 73ms 6 Aug 2024 733rd edsrzf 🇳🇿 872 95 1ms 5 Mar 2025 734th AdrienHache 🇫🇷 870 82 2ms 7 Jan 2024 734th pardouin 🇫🇷 870 82 2ms 8 Oct 2024 734th LostSyntax21 🇬🇧 870 82 1ms 8 Jan 2025 734th TeodorDyakov 🇧🇬 870 82 2ms 5 Mar 2025 738th msbranicky 870 117 266ms 8 Sep 2023 739th primo-ppcg 🇹🇭 869 69 9ms 27 Nov 2019 739th jakzo 869 69 14ms 5 Sep 2021 739th Shanethegamer 🇺🇸 869 69 10ms 25 Apr 2023 742nd dcgjb 868 57 237ms 6 May 2024 743rd ArmaanAS 868 70 9ms 8 Mar 2021 743rd Hebelub 868 70 9ms 5 Jan 2024 743rd Dataen 868 70 9ms 5 Jan 2024 743rd dokutan 868 70 9ms 23 Jan 2024 747th duckyluuk 🇳🇱 867 70 4,255ms 26 Oct 2024 748th snoozingnewt 🇨🇦 867 89 365ms 19 days ago 749th lynn 866 34 38ms 13 Apr 2021 749th jared-hughes 866 34 33ms 30 Sep 2021 749th Natanaelel 🇸🇪 866 34 41ms 28 Nov 2023 749th primo-ppcg 🇹🇭 866 34 34ms 24 Mar 2025 749th SirBogman 🇺🇸 866 34 33ms 8 Jul 2025 749th fuzzylojik-golf 🇺🇸 866 34 34ms 9 Sep 2025 755th MeWhenI 🇻🇦 866 61 4ms 23 May 2023 756th DialFrost 🇸🇬 866 73 1,442ms 12 Oct 2023 757th Steffan153 🇫🇮 866 81 2ms 3 Feb 2023 757th GrayJoKing 🇦🇺 866 81 3ms 12 Feb 2023 759th ovs-code 🇩🇪 866 95 26ms 10 Jan 2023 760th GrayJoKing 🇦🇺 865 61 375ms 15 Jan 2024 760th namelessiw 865 61 328ms 5 Mar 2024 760th neel11235813 865 61 328ms 10 Mar 2024 760th duckyluuk 🇳🇱 865 61 366ms 14 Jul 2024 760th b-illy 🇬🇧 865 61 336ms 14 Sep 2024 760th DialFrost 🇸🇬 865 61 327ms 26 Dec 2024 760th fuzzylojik-golf 🇺🇸 865 61 316ms 30 May 2025 760th CornerMercury 🇬🇧 865 61 319ms 12 Oct 2025 760th snoozingnewt 🇨🇦 865 61 330ms 20 days ago 760th CaedenHarper 🇨🇦 865 61 324ms 13 days ago 770th jared-hughes 864 100 53ms 20 Jul 2022 771st emgordon154 863 30 42ms 10 Sep 2025 772nd annaproxy 863 46 2ms 18 Feb 2022 773rd MeWhenI 🇻🇦 863 98 41ms 28 Aug 2024 774th MeWhenI 🇻🇦 861 78 1ms 27 Dec 2022 775th treeowl 861 79 135ms 27 Feb 2019 775th user189032 861 79 136ms 29 May 2019 775th cbrt-x 861 79 137ms 15 Sep 2023 778th emgordon154 860 58 800ms 22 Dec 2021 779th m-tkach 🇺🇦 860 77 2ms 5 Dec 2023 780th DaCuteRaccoon 859 65 2ms 30 Nov 2022 780th snoozingnewt 🇨🇦 859 65 4ms 1 Sep 2024 780th LostSyntax21 🇬🇧 859 65 2ms 8 Jan 2025 783rd gilufin 858 55 198ms 30 May 2021 783rd Natanaelel 🇸🇪 858 55 43ms 10 May 2023 785th GrayJoKing 🇦🇺 857 70 10ms 20 Sep 2021 785th 0x24a537r9 857 70 12ms 10 Sep 2022 787th stefangimmillaro 856 66 120ms 15 Jul 2023 788th JDiLenarda 🇫🇷 856 71 1,227ms 9 Oct 2020 789th ovs-code 🇩🇪 855 44 157ms 31 Dec 2023 790th MeWhenI 🇻🇦 855 75 35ms 20 Jun 2022 790th sean-niemann 🇺🇸 855 75 39ms 19 Nov 2024 792nd clockworknazo 855 82 4ms 13 Oct 2022 792nd ovs-code 🇩🇪 855 82 5ms 7 Feb 2023 792nd Lydxn 🇨🇦 855 82 4ms 28 Feb 2023 795th MeWhenI 🇻🇦 855 101 60ms 8 May 2022 795th janbehrens 🇩🇪 855 101 52ms 26 Nov 2023 797th MeWhenI 🇻🇦 854 71 4,490ms 24 Oct 2024 797th sean-niemann 🇺🇸 854 71 4,187ms 30 Oct 2024 797th jkelly467 854 71 4,851ms 3 Nov 2025 800th ScottHamper 854 86 299ms 21 Nov 2021 First Prev 721–800 of 3,141 Next Last