The Calendar hole will go live in approximately 7 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 396th emgordon154 919 66 3,097ms 20 Nov 2024 402nd Lydxn 🇨🇦 919 72 2ms 10 Sep 2022 402nd GrayJoKing 🇦🇺 919 72 2ms 10 Sep 2022 402nd JayXon 🇺🇸 919 72 2ms 10 Sep 2022 402nd btnlq 919 72 2ms 11 Sep 2022 402nd Steffan153 🇫🇮 919 72 2ms 19 Aug 2024 407th bforte 919 74 131ms 9 Dec 2018 407th annaproxy 919 74 130ms 12 Jan 2022 407th rak1507 🇬🇧 919 74 140ms 23 Feb 2022 407th Natanaelel 🇸🇪 919 74 143ms 31 May 2025 411th primo-ppcg 🇹🇭 918 41 146ms 6 Oct 2020 411th Natanaelel 🇸🇪 918 41 171ms 7 Oct 2021 411th sisyphus-ppcg 🇦🇺 918 41 147ms 31 Jan 2023 414th Steffan153 🇫🇮 918 64 5ms 11 Dec 2023 414th Yewzir 🇧🇪 918 64 6ms 14 Dec 2023 414th Lydxn 🇨🇦 918 64 6ms 20 Dec 2023 414th dokutan 918 64 5ms 19 May 2024 414th emgordon154 918 64 5ms 5 Dec 2024 414th edsrzf 🇳🇿 918 64 6ms 21 Jan 2025 414th sean-niemann 🇺🇸 918 64 5ms 19 Apr 2025 414th kg583 🇺🇸 918 64 7ms 30 Jul 2025 414th snoozingnewt 🇨🇦 918 64 7ms 23 days ago 423rd primo-ppcg 🇹🇭 918 80 310ms 21 Nov 2021 423rd prplz 🇦🇺 918 80 312ms 21 Nov 2021 423rd annaproxy 918 80 317ms 5 May 2022 423rd tomtheisen 🇺🇸 918 80 349ms 17 Jan 2023 423rd Steffan153 🇫🇮 918 80 384ms 28 Jan 2023 423rd AdrienHache 🇫🇷 918 80 357ms 30 May 2023 423rd MeWhenI 🇻🇦 918 80 349ms 26 Jul 2023 423rd DialFrost 🇸🇬 918 80 348ms 26 Dec 2024 423rd sean-niemann 🇺🇸 918 80 350ms 9 Jan 2025 423rd Yax42 🇫🇷 918 80 366ms 15 Aug 2025 433rd Lydxn 🇨🇦 917 63 3ms 16 Jul 2023 433rd Steffan153 🇫🇮 917 63 136ms 22 Aug 2024 433rd sean-niemann 🇺🇸 917 63 137ms 22 Aug 2024 433rd JayXon 🇺🇸 917 63 138ms 23 Aug 2024 433rd lukegustafson 🇺🇸 917 63 134ms 12 Sep 2024 433rd emplv 🇱🇻 917 63 131ms 17 Jul 2025 439th lifthrasiir 🇰🇷 917 77 9ms 11 Dec 2024 439th jared-hughes 917 77 7ms 15 Dec 2024 441st bendiscz 917 111 262ms 20 Apr 2020 441st emplv 🇱🇻 917 111 266ms 31 Aug 2021 441st jared-hughes 917 111 260ms 27 Feb 2024 441st edsrzf 🇳🇿 917 111 263ms 26 Oct 2024 441st keelimeguy 🇺🇸 917 111 270ms 28 Apr 2025 446th lynn 916 54 189ms 25 May 2022 447th GrayJoKing 🇦🇺 916 69 6ms 29 Apr 2021 447th xsot 🇸🇬 916 69 4ms 16 Jun 2024 449th Lydxn 🇨🇦 916 70 37ms 21 Jun 2022 450th AlephSquirrel 916 83 6ms 21 Jan 2023 450th edsrzf 🇳🇿 916 83 5ms 11 Apr 2025 450th kg583 🇺🇸 916 83 5ms 3 May 2025 453rd btnlq 915 61 2ms 5 Nov 2022 454th Lydxn 🇨🇦 915 76 100ms 14 Oct 2022 454th sean-niemann 🇺🇸 915 76 97ms 14 Oct 2022 454th JayXon 🇺🇸 915 76 95ms 14 Oct 2022 454th MeWhenI 🇻🇦 915 76 99ms 14 Oct 2022 454th Steffan153 🇫🇮 915 76 105ms 14 Oct 2022 454th stefangimmillaro 915 76 98ms 14 Oct 2022 454th Shanethegamer 🇺🇸 915 76 98ms 13 Mar 2023 454th DialFrost 🇸🇬 915 76 100ms 26 Dec 2024 454th snoozingnewt 🇨🇦 915 76 100ms 25 days ago 463rd nwellnhof 🇩🇪 915 78 2ms 7 Jan 2021 463rd Alex-x90 🇺🇸 915 78 1ms 27 Jan 2023 463rd inventshah 915 78 2ms 27 Jan 2023 463rd Steffan153 🇫🇮 915 78 2ms 28 Jan 2023 463rd sean-niemann 🇺🇸 915 78 2ms 7 Mar 2025 468th sisyphus-ppcg 🇦🇺 915 91 1ms 18 May 2022 468th ovs-code 🇩🇪 915 91 1ms 20 May 2022 468th inventshah 915 91 1ms 4 Jun 2022 468th nwellnhof 🇩🇪 915 91 1ms 8 Jul 2022 468th saito-ta 🇯🇵 915 91 1ms 3 Oct 2022 468th retrohun 915 91 1ms 30 Apr 2023 468th btnlq 915 91 1ms 17 May 2023 468th kritixilithos 915 91 1ms 22 May 2024 476th edsrzf 🇳🇿 911 61 641ms 15 Sep 2025 476th sean-niemann 🇺🇸 911 61 659ms 16 Sep 2025 476th DialFrost 🇸🇬 911 61 729ms 12 Nov 2025 476th Yewzir 🇧🇪 911 61 680ms 16 Nov 2025 480th MeWhenI 🇻🇦 911 62 118ms 11 Nov 2021 First Prev 401–480 of 3,140 Next Last