The Calendar hole will go live in approximately 5 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 640th stefangimmillaro 825 72 14ms 29 Sep 2023 640th two-bad 🇬🇧 825 72 13ms 25 Feb 2024 640th KrausRaus 🇺🇸 825 72 13ms 14 Oct 2025 640th Lv0Sys 🇵🇱 825 72 11ms 21 days ago 645th MeWhenI 🇻🇦 824 53 141ms 19 Sep 2021 645th GrayJoKing 🇦🇺 824 53 76ms 20 Sep 2021 645th sean-niemann 🇺🇸 824 53 142ms 20 Sep 2021 645th scpchicken 🇵🇼 824 53 143ms 19 Dec 2022 645th Steffan153 🇫🇮 824 53 141ms 27 Jan 2023 645th DialFrost 🇸🇬 824 53 146ms 28 Jan 2023 645th snoozingnewt 🇨🇦 824 53 141ms 1 Sep 2024 645th fuzzylojik-golf 🇺🇸 824 53 95ms 15 Sep 2025 645th blaztoma 🇱🇹 824 53 141ms 23 Nov 2025 654th andersk 🇺🇸 824 121 121ms 31 Oct 2022 655th Fishron 823 85 245ms 21 Oct 2021 655th aposteriorist 🇨🇦 823 85 20ms 6 Feb 2022 655th TFeld00 🇩🇰 823 85 364ms 22 Apr 2022 655th Ailko 🇧🇪 823 85 68ms 5 May 2022 655th tkr-sh 🇰🇵 823 85 20ms 17 May 2022 655th 051 🇸🇬 823 85 19ms 19 Aug 2022 655th trist224 🇫🇷 823 85 66ms 18 Oct 2022 655th Ripick 823 85 19ms 1 Feb 2023 655th jmerle 🇳🇱 823 85 293ms 16 Feb 2023 655th fkantelberg 823 85 19ms 7 Aug 2023 655th minhtrancccp 823 85 58ms 1 Nov 2023 655th wen1now 823 85 19ms 6 Nov 2023 655th elgan65536 823 85 20ms 28 Nov 2023 655th stertooy 🇧🇪 823 85 19ms 14 Jun 2024 655th FranklinJiaChen 823 85 192ms 5 Aug 2024 655th keelimeguy 🇺🇸 823 85 234ms 17 May 2025 655th KasperKivimaeki 🇫🇮 823 85 20ms 2 Jul 2025 655th albanian-laundromat 823 85 19ms 20 Nov 2025 655th Lv0Sys 🇵🇱 823 85 28ms 21 days ago 674th sean-niemann 🇺🇸 822 86 3,273ms 30 Oct 2024 675th jared-hughes 821 83 126ms 11 Sep 2023 676th Shanethegamer 🇺🇸 821 168 467ms 27 Mar 2025 677th AdrienHache 🇫🇷 820 94 378ms 2 Jun 2023 678th Yewzir 🇧🇪 819 107 40ms 14 Jan 2024 679th Shanethegamer 🇺🇸 818 101 458ms 13 Apr 2023 679th emgordon154 818 101 461ms 26 May 2025 681st snoozingnewt 🇨🇦 817 66 13ms 1 Sep 2024 681st LostSyntax21 🇬🇧 817 66 4ms 8 Jan 2025 683rd dokutan 817 82 568ms 24 Dec 2024 684th snyderek 🇺🇸 817 116 59ms 6 Oct 2024 685th m-tkach 🇺🇦 817 120 28ms 18 Dec 2023 686th Mabeloid 🇳🇴 817 122 122ms 31 Oct 2025 686th CaedenHarper 🇨🇦 817 122 122ms 24 days ago 688th edsrzf 🇳🇿 816 88 11ms 7 Jun 2025 689th Natanaelel 🇸🇪 815 33 76ms 22 Jul 2022 689th SirBogman 🇺🇸 815 33 73ms 10 Sep 2022 691st snoozingnewt 🇨🇦 815 105 81ms 30 Sep 2025 692nd kimbo 🇺🇸 815 146 265ms 12 Jan 2023 693rd janbehrens 🇩🇪 814 73 10ms 20 Sep 2021 693rd didion0 🇺🇸 814 73 41ms 23 Nov 2021 693rd KatieLG 🇬🇧 814 73 14ms 5 Apr 2022 693rd emgordon154 814 73 10ms 7 Nov 2024 697th MeWhenI 🇻🇦 813 71 65ms 5 Apr 2025 698th andre-lameirinhas 🇵🇹 813 86 189ms 4 Nov 2021 698th RYNO8 813 86 61ms 16 Aug 2022 698th LeeCamp 813 86 229ms 15 Jan 2023 698th vishwathg 813 86 334ms 4 Feb 2023 698th cros107 🇦🇺 813 86 242ms 11 Oct 2023 698th logvp 813 86 3,236ms 12 Jan 2024 698th Bmrl7 813 86 12ms 29 Feb 2024 698th Grrisly 813 86 279ms 29 Mar 2024 698th SB-945 813 86 19ms 31 Mar 2024 698th resoNathan 813 86 13ms 18 Jul 2024 698th Andrey2001 813 86 13ms 21 days ago 709th Shanethegamer 🇺🇸 813 100 118ms 19 Sep 2021 709th MichalMarsalek 🇨🇿 813 100 125ms 3 Mar 2022 711th KenanSi 812 32 6ms 24 Feb 2022 711th ashtraypettingzoo 🇺🇸 812 32 6ms 5 Apr 2023 713th ovs-code 🇩🇪 812 66 11ms 15 Aug 2024 713th sisyphus-ppcg 🇦🇺 812 66 14ms 19 Aug 2024 715th OhmNomNom 811 59 38ms 20 Oct 2022 715th AlephSquirrel 811 59 74ms 14 Apr 2023 715th SirBogman 🇺🇸 811 59 76ms 10 Jan 2024 715th error256 811 59 52ms 13 May 2024 719th AlephSquirrel 810 104 4ms 6 Aug 2024 720th GolfingSuccess 🇬🇷 810 117 62ms 19 Mar 2025 First Prev 641–720 of 2,045 Next Last