The Calendar hole will go live in approximately 6 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 792nd JOrE20 🇺🇸 786 89 19ms 21 days ago 802nd NickTheEASDude 🇺🇸 786 97 18ms 9 May 2024 803rd Yax42 🇫🇷 786 98 379ms 13 days ago 804th ListeriaM 785 89 2ms 25 Aug 2023 805th ian-h-chamberlain 🇺🇸 785 127 117ms 21 days ago 806th snoozingnewt 🇨🇦 784 102 96ms 13 Sep 2025 807th Shanethegamer 🇺🇸 782 74 153ms 19 Aug 2024 808th DialFrost 🇸🇬 782 112 42ms 30 Mar 2025 809th aposteriorist 🇨🇦 780 106 460ms 5 Mar 2022 810th yzhs 🇩🇪 779 39 36ms 21 Jun 2022 811th SirBogman 🇺🇸 779 48 286ms 4 Nov 2021 811th SirFireball3521 779 48 263ms 21 Mar 2023 813th prplz 🇦🇺 777 64 1,042ms 20 Sep 2021 814th 2011-Chan-Ethan 777 90 310ms 12 Jul 2023 814th inverseLorentz 🇦🇺 777 90 305ms 3 May 2024 816th Re-Adventures 🇮🇳 777 122 59ms 14 Aug 2022 817th snoozingnewt 🇨🇦 774 105 130ms 3 Oct 2025 818th DialFrost 🇸🇬 773 129 139ms 5 Apr 2025 819th Shanethegamer 🇺🇸 772 93 13ms 8 Apr 2024 820th ovs-code 🇩🇪 772 127 28ms 26 Dec 2022 820th DialFrost 🇸🇬 772 127 94ms 26 days ago 822nd FlyingPenguin223 771 62 65ms 16 Nov 2023 822nd Babafaba 771 62 37ms 15 Oct 2025 824th jared-hughes 771 77 10ms 14 Mar 2022 824th Re-Adventures 🇮🇳 771 77 10ms 14 Aug 2022 824th lyphyser 771 77 9ms 3 Jun 2023 824th helbling 🇨🇭 771 77 10ms 4 Jul 2024 828th KatieLG 🇬🇧 771 111 135ms 14 Jan 2023 829th hjcafaroUC 769 91 20ms 26 Oct 2021 829th adoxography 769 91 19ms 18 Dec 2021 829th j-Ewan 769 91 19ms 16 Feb 2022 829th MaxElf999 769 91 19ms 29 Sep 2022 829th AlexanderFair 769 91 18ms 13 Jul 2023 829th chartung17 769 91 20ms 14 Jan 2024 829th NerdyMcNerd42 769 91 13ms 22 Mar 2024 836th emgordon154 769 146 18ms 10 Jun 2025 837th NewDefectus 🇮🇱 768 64 49ms 21 Sep 2021 838th prplz 🇦🇺 768 91 2ms 19 Dec 2021 839th snoozingnewt 🇨🇦 768 92 3,539ms 27 Sep 2025 840th janbehrens 🇩🇪 767 165 25ms 20 Sep 2021 841st strout 766 89 172ms 15 Aug 2022 842nd MeWhenI 🇻🇦 766 244 16ms 28 Aug 2023 843rd jared-hughes 765 123 428ms 24 Sep 2025 843rd Babafaba 765 123 395ms 14 Oct 2025 845th UnderKoen 🇳🇱 764 147 34ms 20 Apr 2023 846th prplz 🇦🇺 763 49 241ms 27 Sep 2021 847th kTheLemon 763 100 3ms 2 Apr 2025 848th DialFrost 🇸🇬 763 112 41ms 13 Feb 2025 849th Yewzir 🇧🇪 762 166 25ms 14 Jan 2024 850th shawphy 761 78 10ms 12 Oct 2021 851st Indivicivet 760 92 316ms 26 Oct 2021 851st Irratix 🇳🇱 760 92 2ms 19 Dec 2021 851st nullie 760 92 19ms 8 Jun 2022 851st jbjd 760 92 19ms 23 Nov 2024 851st 5quiwyrm 760 92 242ms 25 Nov 2024 851st qpwoeirut 760 92 19ms 23 Nov 2025 857th Shanethegamer 🇺🇸 760 93 3,428ms 27 Oct 2024 858th Andriamanitra 🇫🇮 759 63 49ms 20 Jul 2022 859th Yewzir 🇧🇪 758 99 39ms 18 Dec 2024 860th Irratix 🇳🇱 757 90 141ms 24 Sep 2021 861st MeWhenI 🇻🇦 756 95 14ms 23 May 2023 862nd prplz 🇦🇺 755 66 1,368ms 27 Sep 2021 862nd DialFrost 🇸🇬 755 66 665ms 10 Oct 2024 864th jared-hughes 755 101 2ms 17 Mar 2022 865th Yewzir 🇧🇪 755 102 350ms 13 Jan 2024 866th yzhs 🇩🇪 754 66 989ms 5 Nov 2021 867th emgordon154 754 130 107ms 21 days ago 868th msbranicky 753 89 574ms 17 Jan 2024 868th Stockoh 🇫🇷 753 89 529ms 24 Jun 2024 868th Mabeloid 🇳🇴 753 89 478ms 18 Sep 2024 871st Shanethegamer 🇺🇸 753 168 24ms 20 Sep 2021 872nd emgordon154 752 77 134ms 7 Nov 2024 873rd alasdair-greenland 752 79 22ms 10 Nov 2021 873rd igmcdowell 752 79 10ms 11 Dec 2021 873rd dylanarmstrong 752 79 12ms 24 Jan 2024 876th stewSquared 🇺🇸 752 93 18ms 27 Sep 2022 876th FlorianCassayre 🇫🇷 752 93 212ms 18 Oct 2022 876th ssbhatt4321 752 93 20ms 11 Jun 2023 876th Glinte 752 93 390ms 11 Dec 2023 876th Hebelub 752 93 13ms 5 Jan 2024 First Prev 801–880 of 2,042 Next Last