The Calendar hole will go live in approximately 8 days. Why not try and solve it ahead of time?
Happy Numbers (Long) 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 480th Yewzir 🇧🇪 860 93 126ms 27 Mar 2024 482nd Shanethegamer 🇺🇸 860 98 5ms 20 Dec 2024 483rd DialFrost 🇸🇬 858 58 1,134ms 13 Apr 2025 484th GrayJoKing 🇦🇺 857 105 44ms 12 Mar 2022 485th MeWhenI 🇻🇦 856 51 20ms 15 Feb 2025 486th edsrzf 🇳🇿 856 139 268ms 23 Oct 2024 487th ovs-code 🇩🇪 855 89 12ms 30 Jun 2024 488th Shanethegamer 🇺🇸 855 110 447ms 25 Sep 2025 488th Yewzir 🇧🇪 855 110 446ms 2 Oct 2025 488th CaedenHarper 🇨🇦 855 110 480ms 5 Nov 2025 488th MeWhenI 🇻🇦 855 110 427ms 7 Nov 2025 492nd akshatj27 🇦🇶 854 56 34ms 11 Jan 2022 492nd Steffan153 🇫🇮 854 56 57ms 16 Dec 2022 492nd m-tkach 🇺🇦 854 56 39ms 23 Feb 2023 495th MeWhenI 🇻🇦 854 72 85ms 13 Dec 2022 496th CLOStrophobic 🇮🇹 854 116 506ms 10 Feb 2025 497th MeWhenI 🇻🇦 853 77 64ms 19 Sep 2021 497th snoozingnewt 🇨🇦 853 77 61ms 16 Oct 2025 499th SirBogman 🇺🇸 853 82 211ms 21 Sep 2021 499th stefangimmillaro 853 82 307ms 27 Sep 2021 499th NewDefectus 🇮🇱 853 82 19ms 16 Dec 2021 499th CedricGebistorf 853 82 220ms 25 Feb 2022 499th Shanethegamer 🇺🇸 853 82 300ms 16 Dec 2022 499th aksyristos 853 82 195ms 12 Feb 2023 499th quimey 853 82 205ms 22 Mar 2023 499th StefanHabel 🇨🇦 853 82 302ms 26 Mar 2023 499th Fracture17 853 82 271ms 8 Apr 2023 499th Re-Adventures 🇮🇳 853 82 222ms 20 Jul 2023 499th Natanaelel 🇸🇪 853 82 213ms 29 Oct 2023 499th Just4FunCoder 853 82 289ms 17 Feb 2024 499th codingisgreatbutiamnot 853 82 292ms 25 Jul 2024 499th lifthrasiir 🇰🇷 853 82 13ms 13 Nov 2024 499th klixel 🇨🇦 853 82 292ms 17 Jan 2025 499th blaztoma 🇱🇹 853 82 250ms 15 Nov 2025 499th CommandLeo 🇮🇹 853 82 298ms 20 days ago 499th luuumine 🇫🇷 853 82 303ms 19 days ago 499th FortuiteMan 🇫🇷 853 82 290ms 18 days ago 518th duckyluuk 🇳🇱 853 88 28ms 12 Dec 2024 518th GolfingSuccess 🇬🇷 853 88 22ms 11 Sep 2025 520th emplv 🇱🇻 853 148 24ms 29 Jun 2022 521st marcin7Cd 852 80 146ms 29 Sep 2021 521st cbrt-x 852 80 154ms 15 Sep 2023 523rd primo-ppcg 🇹🇭 852 82 1ms 22 Sep 2021 523rd nwellnhof 🇩🇪 852 82 2ms 22 Sep 2021 523rd Attero 🇸🇪 852 82 3ms 23 Dec 2021 523rd c0d3-4-F00d 🇩🇪 852 82 3ms 5 Jan 2022 523rd snoozingnewt 🇨🇦 852 82 3ms 13 Sep 2025 528th inventshah 852 83 3,973ms 24 Oct 2024 528th aditsu 852 83 3,673ms 10 Aug 2025 530th Lydxn 🇨🇦 852 90 40ms 20 Sep 2021 530th Steffan153 🇫🇮 852 90 40ms 12 Jan 2023 530th stefangimmillaro 852 90 40ms 26 Jan 2023 530th MeWhenI 🇻🇦 852 90 41ms 14 May 2023 530th DialFrost 🇸🇬 852 90 41ms 22 Oct 2024 535th lynn 852 115 28ms 21 Aug 2023 536th The3gs 852 117 129ms 29 Nov 2024 537th snoozingnewt 🇨🇦 851 99 4ms 1 Sep 2024 538th janbehrens 🇩🇪 850 140 268ms 20 Sep 2021 539th KatieLG 🇬🇧 848 79 544ms 16 Jan 2024 539th MeWhenI 🇻🇦 848 79 494ms 17 Jan 2024 539th duckyluuk 🇳🇱 848 79 499ms 20 Jun 2024 539th namelessiw 848 79 483ms 14 Jul 2024 539th lifthrasiir 🇰🇷 848 79 512ms 2 Dec 2024 544th MeWhenI 🇻🇦 847 96 126ms 15 Nov 2022 545th stefangimmillaro 847 111 528ms 6 Oct 2025 545th kmathis22 847 111 403ms 20 Nov 2025 545th ethanlally 847 111 366ms 23 Nov 2025 545th dokutan 847 111 411ms 23 Nov 2025 545th snoozingnewt 🇨🇦 847 111 387ms 17 days ago 550th ovs-code 🇩🇪 847 190 18ms 9 Jul 2024 551st Steffan153 🇫🇮 846 89 17ms 3 Feb 2023 551st sisyphus-ppcg 🇦🇺 846 89 18ms 4 Feb 2023 551st edsrzf 🇳🇿 846 89 13ms 14 Nov 2025 554th Steffan153 🇫🇮 846 99 12ms 12 Dec 2023 555th Irratix 🇳🇱 846 112 61ms 3 Jan 2022 556th MeWhenI 🇻🇦 846 163 565ms 28 Mar 2025 557th rucin93 🇵🇱 845 86 2ms 19 Nov 2025 558th Yewzir 🇧🇪 845 118 127ms 5 Feb 2024 559th rak1507 🇬🇧 844 36 36ms 20 Sep 2021 560th ovs-code 🇩🇪 844 181 1,738ms 14 Sep 2025 First Prev 481–560 of 2,038 Next Last