The Calendar hole will go live in approximately 6 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 397th JayXon 🇺🇸 919 66 3,099ms 7 Nov 2024 397th emgordon154 919 66 3,097ms 20 Nov 2024 403rd Lydxn 🇨🇦 919 72 2ms 10 Sep 2022 403rd GrayJoKing 🇦🇺 919 72 2ms 10 Sep 2022 403rd JayXon 🇺🇸 919 72 2ms 10 Sep 2022 403rd btnlq 919 72 2ms 11 Sep 2022 403rd Steffan153 🇫🇮 919 72 2ms 19 Aug 2024 408th bforte 919 74 131ms 9 Dec 2018 408th annaproxy 919 74 130ms 12 Jan 2022 408th rak1507 🇬🇧 919 74 140ms 23 Feb 2022 408th Natanaelel 🇸🇪 919 74 143ms 31 May 2025 412th primo-ppcg 🇹🇭 918 41 146ms 6 Oct 2020 412th Natanaelel 🇸🇪 918 41 171ms 7 Oct 2021 412th sisyphus-ppcg 🇦🇺 918 41 147ms 31 Jan 2023 415th Steffan153 🇫🇮 918 64 5ms 11 Dec 2023 415th Yewzir 🇧🇪 918 64 6ms 14 Dec 2023 415th Lydxn 🇨🇦 918 64 6ms 20 Dec 2023 415th dokutan 918 64 5ms 19 May 2024 415th emgordon154 918 64 5ms 5 Dec 2024 415th edsrzf 🇳🇿 918 64 6ms 21 Jan 2025 415th sean-niemann 🇺🇸 918 64 5ms 19 Apr 2025 415th kg583 🇺🇸 918 64 7ms 30 Jul 2025 415th snoozingnewt 🇨🇦 918 64 7ms 25 days ago 424th primo-ppcg 🇹🇭 918 80 310ms 21 Nov 2021 424th prplz 🇦🇺 918 80 312ms 21 Nov 2021 424th annaproxy 918 80 317ms 5 May 2022 424th tomtheisen 🇺🇸 918 80 349ms 17 Jan 2023 424th Steffan153 🇫🇮 918 80 384ms 28 Jan 2023 424th AdrienHache 🇫🇷 918 80 357ms 30 May 2023 424th MeWhenI 🇻🇦 918 80 349ms 26 Jul 2023 424th DialFrost 🇸🇬 918 80 348ms 26 Dec 2024 424th sean-niemann 🇺🇸 918 80 350ms 9 Jan 2025 424th Yax42 🇫🇷 918 80 366ms 15 Aug 2025 434th Lydxn 🇨🇦 917 63 3ms 16 Jul 2023 434th Steffan153 🇫🇮 917 63 136ms 22 Aug 2024 434th sean-niemann 🇺🇸 917 63 137ms 22 Aug 2024 434th JayXon 🇺🇸 917 63 138ms 23 Aug 2024 434th lukegustafson 🇺🇸 917 63 134ms 12 Sep 2024 434th emplv 🇱🇻 917 63 131ms 17 Jul 2025 440th lifthrasiir 🇰🇷 917 77 9ms 11 Dec 2024 440th jared-hughes 917 77 7ms 15 Dec 2024 442nd bendiscz 917 111 262ms 20 Apr 2020 442nd emplv 🇱🇻 917 111 266ms 31 Aug 2021 442nd jared-hughes 917 111 260ms 27 Feb 2024 442nd edsrzf 🇳🇿 917 111 263ms 26 Oct 2024 442nd keelimeguy 🇺🇸 917 111 270ms 28 Apr 2025 447th lynn 916 54 189ms 25 May 2022 448th GrayJoKing 🇦🇺 916 69 6ms 29 Apr 2021 448th xsot 🇸🇬 916 69 4ms 16 Jun 2024 450th Lydxn 🇨🇦 916 70 37ms 21 Jun 2022 451st AlephSquirrel 916 83 6ms 21 Jan 2023 451st edsrzf 🇳🇿 916 83 5ms 11 Apr 2025 451st kg583 🇺🇸 916 83 5ms 3 May 2025 454th btnlq 915 61 2ms 5 Nov 2022 455th Lydxn 🇨🇦 915 76 100ms 14 Oct 2022 455th sean-niemann 🇺🇸 915 76 97ms 14 Oct 2022 455th JayXon 🇺🇸 915 76 95ms 14 Oct 2022 455th MeWhenI 🇻🇦 915 76 99ms 14 Oct 2022 455th Steffan153 🇫🇮 915 76 105ms 14 Oct 2022 455th stefangimmillaro 915 76 98ms 14 Oct 2022 455th Shanethegamer 🇺🇸 915 76 98ms 13 Mar 2023 455th DialFrost 🇸🇬 915 76 100ms 26 Dec 2024 455th snoozingnewt 🇨🇦 915 76 100ms 26 days ago 464th nwellnhof 🇩🇪 915 78 2ms 7 Jan 2021 464th Alex-x90 🇺🇸 915 78 1ms 27 Jan 2023 464th inventshah 915 78 2ms 27 Jan 2023 464th Steffan153 🇫🇮 915 78 2ms 28 Jan 2023 464th sean-niemann 🇺🇸 915 78 2ms 7 Mar 2025 469th sisyphus-ppcg 🇦🇺 915 91 1ms 18 May 2022 469th ovs-code 🇩🇪 915 91 1ms 20 May 2022 469th inventshah 915 91 1ms 4 Jun 2022 469th nwellnhof 🇩🇪 915 91 1ms 8 Jul 2022 469th saito-ta 🇯🇵 915 91 1ms 3 Oct 2022 469th retrohun 915 91 1ms 30 Apr 2023 469th btnlq 915 91 1ms 17 May 2023 469th kritixilithos 915 91 1ms 22 May 2024 477th edsrzf 🇳🇿 911 61 641ms 15 Sep 2025 477th sean-niemann 🇺🇸 911 61 659ms 16 Sep 2025 477th DialFrost 🇸🇬 911 61 729ms 12 Nov 2025 477th Yewzir 🇧🇪 911 61 680ms 16 Nov 2025 First Prev 401–480 of 3,140 Next Last