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 481st sisyphus-ppcg 🇦🇺 911 77 2ms 3 Feb 2023 482nd Shanethegamer 🇺🇸 910 63 65ms 18 May 2022 482nd Yewzir 🇧🇪 910 63 66ms 9 Nov 2023 482nd Betuaredead 910 63 68ms 13 Nov 2023 482nd albanian-laundromat 910 63 69ms 8 Nov 2025 482nd snoozingnewt 🇨🇦 910 63 65ms 17 days ago 487th Lydxn 🇨🇦 910 74 37ms 14 Jul 2021 487th JayXon 🇺🇸 910 74 38ms 20 Aug 2021 487th stefangimmillaro 910 74 40ms 22 Apr 2023 490th sisyphus-ppcg 🇦🇺 910 91 1ms 20 Jul 2022 490th UnderKoen 🇳🇱 910 91 1ms 6 Mar 2023 490th m-tkach 🇺🇦 910 91 1ms 9 Mar 2023 490th Lydxn 🇨🇦 910 91 1ms 19 Jul 2023 494th pihart 909 66 10ms 22 Jun 2020 494th Argeento 🇵🇱 909 66 9ms 13 Nov 2020 494th ovs-code 🇩🇪 909 66 10ms 29 Jul 2024 494th Lv0Sys 🇵🇱 909 66 10ms 24 days ago 498th dvargas46 🇺🇸 908 55 53ms 15 Nov 2022 499th Lydxn 🇨🇦 908 85 464ms 27 Feb 2022 499th JayXon 🇺🇸 908 85 455ms 28 Feb 2022 499th GrayJoKing 🇦🇺 908 85 438ms 13 Mar 2022 502nd anter69 🇭🇺 907 55 1,011ms 10 Mar 2025 503rd Waffle3z 907 74 2ms 9 Jul 2021 504th prplz 🇦🇺 907 75 145ms 12 Oct 2021 504th YAJUE114514 907 75 139ms 30 Jul 2025 506th JayXon 🇺🇸 907 76 2ms 19 Nov 2025 507th fuzzylojik-golf 🇺🇸 907 81 376ms 7 Sep 2025 508th frankgraziano 907 144 11ms 11 Aug 2025 508th primo-ppcg 🇹🇭 907 144 13ms 13 Aug 2025 508th DialFrost 🇸🇬 907 144 9ms 13 Aug 2025 511th Yax42 🇫🇷 906 92 413ms 12 Nov 2025 512th MeWhenI 🇻🇦 905 67 4ms 16 Dec 2024 512th Yewzir 🇧🇪 905 67 5ms 20 Dec 2024 512th GrayJoKing 🇦🇺 905 67 4ms 31 Jan 2025 515th canissimia 🇦🇶 905 194 4ms 21 Sep 2021 516th MeWhenI 🇻🇦 904 65 5ms 12 Dec 2023 517th Steffan153 🇫🇮 904 91 28ms 28 Jan 2023 517th GrayJoKing 🇦🇺 904 91 27ms 28 Jan 2023 517th Lydxn 🇨🇦 904 91 27ms 28 Jan 2023 517th m-tkach 🇺🇦 904 91 27ms 18 Jan 2024 517th sean-niemann 🇺🇸 904 91 27ms 19 May 2025 522nd janbehrens 🇩🇪 903 70 5ms 26 Nov 2023 523rd emplv 🇱🇻 903 77 99ms 14 Mar 2023 524th lynn 903 79 2ms 2 Oct 2021 524th MeWhenI 🇻🇦 903 79 2ms 21 Jun 2022 524th m-tkach 🇺🇦 903 79 1ms 9 Mar 2023 524th ovs-code 🇩🇪 903 79 2ms 24 Mar 2024 524th xsot 🇸🇬 903 79 2ms 23 May 2024 524th DialFrost 🇸🇬 903 79 11ms 17 Dec 2024 530th rucin93 🇵🇱 902 64 129ms 6 Sep 2024 531st Lydxn 🇨🇦 901 91 26ms 16 Apr 2022 531st JayXon 🇺🇸 901 91 24ms 17 Apr 2022 531st m-tkach 🇺🇦 901 91 24ms 9 Mar 2023 534th juliansiebert 🇩🇪 900 55 247ms 31 Jul 2022 535th tailorspy 900 96 54ms 22 Sep 2024 536th MeWhenI 🇻🇦 899 75 4ms 22 Mar 2024 537th Shanethegamer 🇺🇸 897 78 137ms 7 Nov 2025 537th emgordon154 897 78 101ms 26 days ago 537th GolfingSuccess 🇬🇷 897 78 115ms 26 days ago 537th edsrzf 🇳🇿 897 78 106ms 26 days ago 537th DialFrost 🇸🇬 897 78 90ms 25 days ago 537th snoozingnewt 🇨🇦 897 78 124ms 24 days ago 537th sean-niemann 🇺🇸 897 78 99ms 16 days ago 544th thospel 896 42 203ms 25 Jun 2018 544th Lydxn 🇨🇦 896 42 176ms 21 Feb 2023 546th GolfingSuccess 🇬🇷 896 77 2ms 19 Mar 2025 546th sean-niemann 🇺🇸 896 77 2ms 19 Nov 2025 548th MeWhenI 🇻🇦 896 93 1ms 18 May 2022 549th ETHproductions 🇺🇸 895 67 10ms 14 Apr 2018 550th DaDerpDuck 894 75 1ms 24 Jan 2021 551st marcin7Cd 894 85 5ms 15 Feb 2021 551st primo-ppcg 🇹🇭 894 85 5ms 1 Mar 2021 551st CLOStrophobic 🇮🇹 894 85 5ms 14 Feb 2025 554th lifthrasiir 🇰🇷 893 28 3ms 29 Nov 2024 555th Constructor7 893 68 9ms 24 Feb 2018 555th GolfingSuccess 🇬🇷 893 68 9ms 26 Mar 2018 555th kmaork 🇮🇱 893 68 9ms 18 Apr 2018 555th edre 893 68 9ms 30 Apr 2018 555th j55d 893 68 9ms 19 Sep 2018 555th daedals 893 68 9ms 16 Apr 2019 First Prev 481–560 of 3,139 Next Last