The Calendar hole will go live in approximately 13 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 Shanethegamer 🇺🇸 910 63 65ms 18 May 2022 481st Yewzir 🇧🇪 910 63 66ms 9 Nov 2023 481st Betuaredead 910 63 68ms 13 Nov 2023 481st albanian-laundromat 910 63 69ms 8 Nov 2025 481st snoozingnewt 🇨🇦 910 63 65ms 11 days ago 486th Lydxn 🇨🇦 910 74 37ms 14 Jul 2021 486th JayXon 🇺🇸 910 74 38ms 20 Aug 2021 486th stefangimmillaro 910 74 40ms 22 Apr 2023 489th sisyphus-ppcg 🇦🇺 910 91 1ms 20 Jul 2022 489th UnderKoen 🇳🇱 910 91 1ms 6 Mar 2023 489th m-tkach 🇺🇦 910 91 1ms 9 Mar 2023 489th Lydxn 🇨🇦 910 91 1ms 19 Jul 2023 493rd pihart 909 66 10ms 22 Jun 2020 493rd Argeento 🇵🇱 909 66 9ms 13 Nov 2020 493rd ovs-code 🇩🇪 909 66 10ms 29 Jul 2024 493rd Lv0Sys 🇵🇱 909 66 10ms 19 days ago 497th dvargas46 🇺🇸 908 55 61ms 15 Nov 2022 498th Waffle3z 908 74 1ms 9 Jul 2021 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 prplz 🇦🇺 907 75 145ms 12 Oct 2021 503rd YAJUE114514 907 75 139ms 30 Jul 2025 505th JayXon 🇺🇸 907 76 2ms 19 Nov 2025 506th fuzzylojik-golf 🇺🇸 907 81 376ms 7 Sep 2025 507th frankgraziano 907 144 11ms 11 Aug 2025 507th primo-ppcg 🇹🇭 907 144 13ms 13 Aug 2025 507th DialFrost 🇸🇬 907 144 9ms 13 Aug 2025 510th Yax42 🇫🇷 906 92 413ms 12 Nov 2025 511th MeWhenI 🇻🇦 905 67 4ms 16 Dec 2024 511th Yewzir 🇧🇪 905 67 5ms 20 Dec 2024 511th GrayJoKing 🇦🇺 905 67 4ms 31 Jan 2025 514th canissimia 🇦🇶 905 194 4ms 21 Sep 2021 515th MeWhenI 🇻🇦 904 65 5ms 12 Dec 2023 516th Steffan153 🇫🇮 904 91 28ms 28 Jan 2023 516th GrayJoKing 🇦🇺 904 91 27ms 28 Jan 2023 516th Lydxn 🇨🇦 904 91 27ms 28 Jan 2023 516th m-tkach 🇺🇦 904 91 27ms 18 Jan 2024 516th sean-niemann 🇺🇸 904 91 27ms 19 May 2025 521st janbehrens 🇩🇪 903 70 4ms 26 Nov 2023 522nd emplv 🇱🇻 903 77 99ms 14 Mar 2023 523rd lynn 903 79 2ms 2 Oct 2021 523rd MeWhenI 🇻🇦 903 79 2ms 21 Jun 2022 523rd m-tkach 🇺🇦 903 79 1ms 9 Mar 2023 523rd ovs-code 🇩🇪 903 79 2ms 24 Mar 2024 523rd xsot 🇸🇬 903 79 2ms 23 May 2024 523rd DialFrost 🇸🇬 903 79 11ms 17 Dec 2024 529th rucin93 🇵🇱 902 64 129ms 6 Sep 2024 530th Lydxn 🇨🇦 901 91 26ms 16 Apr 2022 530th JayXon 🇺🇸 901 91 24ms 17 Apr 2022 530th m-tkach 🇺🇦 901 91 24ms 9 Mar 2023 533rd juliansiebert 🇩🇪 900 55 247ms 31 Jul 2022 534th tailorspy 900 96 54ms 22 Sep 2024 535th MeWhenI 🇻🇦 899 75 4ms 22 Mar 2024 536th Shanethegamer 🇺🇸 897 78 137ms 7 Nov 2025 536th emgordon154 897 78 101ms 21 days ago 536th GolfingSuccess 🇬🇷 897 78 115ms 20 days ago 536th edsrzf 🇳🇿 897 78 106ms 20 days ago 536th DialFrost 🇸🇬 897 78 90ms 19 days ago 536th snoozingnewt 🇨🇦 897 78 124ms 18 days ago 536th sean-niemann 🇺🇸 897 78 99ms 10 days ago 543rd thospel 896 42 284ms 25 Jun 2018 543rd Lydxn 🇨🇦 896 42 223ms 21 Feb 2023 545th DaDerpDuck 896 75 1ms 24 Jan 2021 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 marcin7Cd 894 85 5ms 15 Feb 2021 550th primo-ppcg 🇹🇭 894 85 5ms 1 Mar 2021 550th CLOStrophobic 🇮🇹 894 85 5ms 14 Feb 2025 553rd lifthrasiir 🇰🇷 893 28 3ms 29 Nov 2024 554th Constructor7 893 68 9ms 24 Feb 2018 554th GolfingSuccess 🇬🇷 893 68 9ms 26 Mar 2018 554th kmaork 🇮🇱 893 68 9ms 18 Apr 2018 554th edre 893 68 9ms 30 Apr 2018 554th j55d 893 68 9ms 19 Sep 2018 554th daedals 893 68 9ms 16 Apr 2019 554th villfa 893 68 9ms 20 May 2019 First Prev 481–560 of 3,141 Next Last