The Calendar hole will go live in approximately 4 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 800th amazingalek 854 86 348ms 93 mins ago 802nd ovs-code 🇩🇪 851 62 358ms 2 Mar 2024 802nd BREMAUCY 🇫🇷 851 62 348ms 20 days ago 804th Yewzir 🇧🇪 851 98 386ms 2 Oct 2025 805th RussellEmerine 850 80 138ms 30 Nov 2019 805th iczelia 🇩🇪 850 80 159ms 20 Oct 2025 807th NewDefectus 🇮🇱 850 84 2ms 16 Dec 2021 808th btnlq 849 68 3ms 16 Jul 2023 808th ovs-code 🇩🇪 849 68 128ms 3 Aug 2024 810th DialFrost 🇸🇬 849 78 2ms 26 Dec 2024 811th DialFrost 🇸🇬 849 79 2ms 26 Dec 2024 812th prplz 🇦🇺 847 96 119ms 30 Apr 2022 812th elgan65536 847 96 117ms 11 Nov 2023 814th dokutan 847 102 49ms 14 Apr 2024 815th kg583 🇺🇸 846 95 42ms 26 Jul 2025 816th lynn 845 59 888ms 25 May 2022 816th DialFrost 🇸🇬 845 59 907ms 26 Dec 2024 816th janlelis 845 59 884ms 14 Aug 2025 819th jared-hughes 845 71 9ms 29 Oct 2021 819th stefangimmillaro 845 71 9ms 27 Aug 2022 819th Maznek 845 71 9ms 19 Jun 2023 819th KrausRaus 🇺🇸 845 71 9ms 14 Oct 2025 819th snoozingnewt 🇨🇦 845 71 9ms 29 Nov 2025 824th Frowny 844 72 9ms 3 Jul 2020 824th lifthrasiir 🇰🇷 844 72 9ms 13 Nov 2024 826th primo-ppcg 🇹🇭 843 67 117ms 27 Mar 2021 826th Steffan153 🇫🇮 843 67 119ms 28 Jan 2023 826th edsrzf 🇳🇿 843 67 123ms 23 Jun 2025 826th snoozingnewt 🇨🇦 843 67 136ms 29 Nov 2025 830th snoozingnewt 🇨🇦 842 66 714ms 29 Nov 2025 831st villfa 842 75 19ms 30 Nov 2018 831st LostSyntax21 🇬🇧 842 75 14ms 8 Jan 2025 833rd Jacob385 842 99 431ms 27 Oct 2025 834th jslip 841 35 33ms 5 Sep 2018 834th rak1507 🇬🇧 841 35 34ms 20 Sep 2021 836th ovs-code 🇩🇪 841 82 5ms 19 Nov 2025 837th Steffan153 🇫🇮 841 99 1ms 28 Jan 2023 837th pardouin 🇫🇷 841 99 1ms 21 Sep 2024 837th sean-niemann 🇺🇸 841 99 1ms 9 May 2025 840th Laar 840 81 137ms 1 Apr 2019 840th alomiF 840 81 136ms 5 Oct 2023 840th brimstonetrader 840 81 115ms 26 Jan 2024 843rd annaproxy 840 85 2ms 18 May 2023 844th HumanEquivalentUnit 839 59 356ms 10 Oct 2020 845th snoozingnewt 🇨🇦 839 80 2ms 29 Nov 2025 846th MeWhenI 🇻🇦 839 92 450ms 10 Oct 2022 847th AdrienHache 🇫🇷 839 103 56ms 7 Jan 2024 848th Yewzir 🇧🇪 838 79 2ms 22 Dec 2023 848th albanian-laundromat 838 79 2ms 24 Jun 2025 850th edsrzf 🇳🇿 838 97 120ms 4 Mar 2025 851st SirFireball3521 836 45 138ms 22 Mar 2023 852nd GrayJoKing 🇦🇺 836 80 100ms 15 Jul 2023 853rd snoozingnewt 🇨🇦 835 84 3ms 18 days ago 854th Shanethegamer 🇺🇸 833 30 3ms 13 Jan 2022 855th PatrickStephansen 🇿🇦 833 72 10ms 3 Nov 2020 855th KatieLG 🇬🇧 833 72 10ms 16 Apr 2021 855th neihousaigaai 833 72 10ms 18 Apr 2021 855th two-bad 🇬🇧 833 72 10ms 25 Feb 2024 859th mogron 832 73 9ms 13 Dec 2019 859th FlorianCassayre 🇫🇷 832 73 9ms 30 Oct 2022 859th StefanHabel 🇨🇦 832 73 9ms 11 Dec 2022 859th DrakeSeteraO 832 73 9ms 25 Oct 2025 863rd duckyluuk 🇳🇱 831 73 4ms 16 Dec 2024 864th acacopardo 831 76 15ms 14 Nov 2017 864th MeWhenI 🇻🇦 831 76 14ms 15 Sep 2021 864th DaCuteRaccoon 831 76 17ms 30 Nov 2022 867th marshallward 🇺🇸 831 81 39ms 2 Sep 2022 868th Lydxn 🇨🇦 831 83 1ms 10 Oct 2023 869th djeedjay 🇳🇱 830 86 2ms 26 Oct 2020 869th Yewzir 🇧🇪 830 86 2ms 22 Dec 2023 871st fuzzylojik-golf 🇺🇸 830 93 433ms 30 Aug 2025 872nd kgodara 830 98 118ms 11 Mar 2023 873rd GrayJoKing 🇦🇺 829 53 23ms 10 Apr 2021 873rd scpchicken 🇵🇼 829 53 31ms 23 May 2021 873rd kurkale6ka 829 53 18ms 16 Jun 2021 873rd sean-niemann 🇺🇸 829 53 30ms 7 Sep 2021 873rd MeWhenI 🇻🇦 829 53 31ms 15 Sep 2021 873rd DaCuteRaccoon 829 53 31ms 30 Nov 2022 873rd Steffan153 🇫🇮 829 53 31ms 28 Jan 2023 873rd DialFrost 🇸🇬 829 53 32ms 28 Jan 2023 First Prev 801–880 of 3,144 Next Last