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 801st NickTheEASDude 🇺🇸 786 97 18ms 9 May 2024 802nd Yax42 🇫🇷 786 98 379ms 12 days ago 803rd ListeriaM 785 89 2ms 25 Aug 2023 804th ian-h-chamberlain 🇺🇸 785 127 117ms 20 days ago 805th snoozingnewt 🇨🇦 784 102 96ms 13 Sep 2025 806th Shanethegamer 🇺🇸 782 74 153ms 19 Aug 2024 807th DialFrost 🇸🇬 782 112 42ms 30 Mar 2025 808th aposteriorist 🇨🇦 780 106 460ms 5 Mar 2022 809th yzhs 🇩🇪 779 39 36ms 21 Jun 2022 810th SirBogman 🇺🇸 779 48 286ms 4 Nov 2021 810th SirFireball3521 779 48 263ms 21 Mar 2023 812th prplz 🇦🇺 777 64 1,042ms 20 Sep 2021 813th 2011-Chan-Ethan 777 90 310ms 12 Jul 2023 813th inverseLorentz 🇦🇺 777 90 305ms 3 May 2024 815th Re-Adventures 🇮🇳 777 122 59ms 14 Aug 2022 816th snoozingnewt 🇨🇦 774 105 130ms 3 Oct 2025 817th DialFrost 🇸🇬 773 129 139ms 5 Apr 2025 818th Shanethegamer 🇺🇸 772 93 13ms 8 Apr 2024 819th ovs-code 🇩🇪 772 127 28ms 26 Dec 2022 819th DialFrost 🇸🇬 772 127 94ms 25 days ago 821st FlyingPenguin223 771 62 48ms 16 Nov 2023 821st Babafaba 771 62 38ms 15 Oct 2025 823rd jared-hughes 771 77 10ms 14 Mar 2022 823rd Re-Adventures 🇮🇳 771 77 10ms 14 Aug 2022 823rd lyphyser 771 77 9ms 3 Jun 2023 823rd helbling 🇨🇭 771 77 10ms 4 Jul 2024 827th KatieLG 🇬🇧 771 111 135ms 14 Jan 2023 828th hjcafaroUC 769 91 20ms 26 Oct 2021 828th adoxography 769 91 19ms 18 Dec 2021 828th j-Ewan 769 91 19ms 16 Feb 2022 828th MaxElf999 769 91 19ms 29 Sep 2022 828th AlexanderFair 769 91 18ms 13 Jul 2023 828th chartung17 769 91 20ms 14 Jan 2024 828th NerdyMcNerd42 769 91 13ms 22 Mar 2024 835th emgordon154 769 146 18ms 10 Jun 2025 836th NewDefectus 🇮🇱 768 64 49ms 21 Sep 2021 837th prplz 🇦🇺 768 91 2ms 19 Dec 2021 838th snoozingnewt 🇨🇦 768 92 3,539ms 27 Sep 2025 839th strout 766 89 172ms 15 Aug 2022 840th MeWhenI 🇻🇦 766 244 16ms 28 Aug 2023 841st jared-hughes 765 123 428ms 24 Sep 2025 841st Babafaba 765 123 395ms 14 Oct 2025 843rd janbehrens 🇩🇪 765 165 25ms 20 Sep 2021 844th UnderKoen 🇳🇱 764 147 34ms 20 Apr 2023 845th prplz 🇦🇺 763 49 241ms 27 Sep 2021 846th kTheLemon 763 100 3ms 2 Apr 2025 847th DialFrost 🇸🇬 763 112 41ms 13 Feb 2025 848th shawphy 761 78 10ms 12 Oct 2021 849th Yewzir 🇧🇪 761 166 25ms 14 Jan 2024 850th Indivicivet 760 92 316ms 26 Oct 2021 850th Irratix 🇳🇱 760 92 2ms 19 Dec 2021 850th nullie 760 92 19ms 8 Jun 2022 850th jbjd 760 92 19ms 23 Nov 2024 850th 5quiwyrm 760 92 242ms 25 Nov 2024 850th qpwoeirut 760 92 19ms 23 Nov 2025 856th Shanethegamer 🇺🇸 760 93 4,377ms 27 Oct 2024 857th Andriamanitra 🇫🇮 759 63 47ms 20 Jul 2022 858th Yewzir 🇧🇪 758 99 39ms 18 Dec 2024 859th Irratix 🇳🇱 757 90 141ms 24 Sep 2021 860th MeWhenI 🇻🇦 756 95 14ms 23 May 2023 861st prplz 🇦🇺 755 66 1,368ms 27 Sep 2021 861st DialFrost 🇸🇬 755 66 665ms 10 Oct 2024 863rd jared-hughes 755 101 2ms 17 Mar 2022 864th Yewzir 🇧🇪 755 102 350ms 13 Jan 2024 865th yzhs 🇩🇪 754 66 989ms 5 Nov 2021 866th emgordon154 754 130 107ms 20 days ago 867th msbranicky 753 89 574ms 17 Jan 2024 867th Stockoh 🇫🇷 753 89 529ms 24 Jun 2024 867th Mabeloid 🇳🇴 753 89 478ms 18 Sep 2024 870th emgordon154 752 77 134ms 7 Nov 2024 871st alasdair-greenland 752 79 22ms 10 Nov 2021 871st igmcdowell 752 79 10ms 11 Dec 2021 871st dylanarmstrong 752 79 12ms 24 Jan 2024 874th stewSquared 🇺🇸 752 93 18ms 27 Sep 2022 874th FlorianCassayre 🇫🇷 752 93 212ms 18 Oct 2022 874th ssbhatt4321 752 93 20ms 11 Jun 2023 874th Glinte 752 93 390ms 11 Dec 2023 874th Hebelub 752 93 13ms 5 Jan 2024 874th tobeannouncd 752 93 18ms 25 Apr 2025 874th YAJUE114514 752 93 403ms 28 Jul 2025 First Prev 801–880 of 2,041 Next Last