The Calendar hole will go live in approximately 13 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 559th MeWhenI 🇻🇦 844 181 1,677ms 7 Nov 2025 559th Yewzir 🇧🇪 844 181 2,518ms 14 Nov 2025 563rd Steffan153 🇫🇮 843 73 229ms 15 Aug 2024 563rd albanian-laundromat 843 73 749ms 23 Sep 2025 565th itsjustfreekie 843 83 305ms 20 Sep 2021 565th neihousaigaai 843 83 19ms 3 Jan 2022 565th cesarm4 843 83 184ms 16 Apr 2022 565th nstearns96 🇬🇧 843 83 245ms 27 Jan 2023 565th randolchance 843 83 19ms 16 Feb 2023 565th galloj 🇨🇿 843 83 3,253ms 5 Mar 2023 565th yzhs 🇩🇪 843 83 244ms 23 Jun 2023 565th Yewzir 🇧🇪 843 83 247ms 8 Oct 2023 565th m42km 843 83 304ms 12 Oct 2023 574th DialFrost 🇸🇬 843 98 379ms 16 Nov 2025 575th emplv 🇱🇻 842 78 47ms 19 Apr 2024 576th pardouin 🇫🇷 842 83 3ms 8 Oct 2024 576th LostSyntax21 🇬🇧 842 83 3ms 8 Jan 2025 578th Waffle3z 840 91 2ms 19 Sep 2021 578th primo-ppcg 🇹🇭 840 91 2ms 23 Sep 2021 578th JayXon 🇺🇸 840 91 2ms 3 Oct 2021 578th Lydxn 🇨🇦 840 91 2ms 9 Apr 2022 578th btnlq 840 91 2ms 27 Dec 2022 578th FlyingPenguin223 840 91 2ms 29 Oct 2024 584th Shanethegamer 🇺🇸 840 95 106ms 14 Oct 2022 584th emplv 🇱🇻 840 95 101ms 28 Oct 2022 584th Yewzir 🇧🇪 840 95 100ms 28 Mar 2024 587th Shanethegamer 🇺🇸 839 31 6ms 13 Jan 2022 588th anter69 🇭🇺 839 57 38ms 30 Sep 2021 589th ovs-code 🇩🇪 839 69 134ms 3 Aug 2024 590th SirBogman 🇺🇸 838 80 455ms 15 Jan 2024 590th Shanethegamer 🇺🇸 838 80 483ms 16 Jan 2024 590th snoozingnewt 🇨🇦 838 80 555ms 28 Sep 2025 593rd Shanethegamer 🇺🇸 838 95 124ms 16 Dec 2022 594th MeWhenI 🇻🇦 838 113 84ms 29 Nov 2022 595th lynn 838 119 148ms 10 Mar 2022 595th ovs-code 🇩🇪 838 119 130ms 23 Jun 2023 595th mousetail 🇳🇱 838 119 131ms 15 Jan 2024 598th edsrzf 🇳🇿 837 100 20ms 5 Jan 2025 599th Shanethegamer 🇺🇸 837 102 1,305ms 20 Mar 2023 600th Yewzir 🇧🇪 835 87 2ms 20 Nov 2025 601st stackofbears 835 99 460ms 21 Mar 2022 602nd albanian-laundromat 835 105 40ms 7 Sep 2025 603rd Bonjour27891 🇻🇳 833 84 63ms 9 Feb 2022 603rd RDShah 833 84 343ms 11 May 2022 603rd fredrik-bakke 🇳🇴 833 84 302ms 2 Oct 2022 603rd jakobkordez 🇸🇮 833 84 20ms 30 Oct 2022 603rd thehylian 833 84 19ms 2 Jan 2023 603rd badboj40 833 84 293ms 12 Feb 2023 603rd firegene 🇮🇪 833 84 20ms 22 Dec 2023 603rd moustave 833 84 166ms 26 Nov 2024 603rd dokutan 833 84 243ms 24 Dec 2024 612th h3ra993huskp 🇯🇵 832 113 442ms 18 days ago 613th prplz 🇦🇺 831 103 122ms 18 Dec 2021 613th dokutan 831 103 84ms 6 Nov 2025 615th Shanethegamer 🇺🇸 831 114 86ms 18 Dec 2022 615th Yewzir 🇧🇪 831 114 80ms 14 Jan 2024 617th Shanethegamer 🇺🇸 831 120 123ms 13 Jan 2022 617th MeWhenI 🇻🇦 831 120 126ms 9 May 2023 617th emgordon154 831 120 123ms 14 Mar 2025 620th ovs-code 🇩🇪 831 166 448ms 29 Mar 2025 620th emgordon154 831 166 435ms 21 May 2025 622nd inventshah 829 60 1,055ms 29 Sep 2023 622nd emgordon154 829 60 821ms 18 Nov 2024 624th albanian-laundromat 829 96 163ms 13 Nov 2025 625th m42km 827 81 536ms 4 Feb 2024 625th Babafaba 827 81 565ms 3 Nov 2025 627th IanUtley 827 92 2,995ms 24 Oct 2023 628th sean-niemann 🇺🇸 827 106 40ms 21 Apr 2023 629th Shanethegamer 🇺🇸 826 88 2ms 19 Nov 2025 629th DialFrost 🇸🇬 826 88 2ms 2 days ago 631st inventshah 826 98 538ms 10 Sep 2022 631st MeWhenI 🇻🇦 826 98 12ms 16 Aug 2023 633rd Waffle3z 825 58 119ms 19 Sep 2021 633rd emgordon154 825 58 34ms 12 Dec 2021 633rd jbbarth 🇫🇷 825 58 37ms 5 Nov 2022 636th neihousaigaai 825 72 10ms 2 Oct 2021 636th stefangimmillaro 825 72 14ms 29 Sep 2023 636th two-bad 🇬🇧 825 72 13ms 25 Feb 2024 636th KrausRaus 🇺🇸 825 72 13ms 14 Oct 2025 636th Lv0Sys 🇵🇱 825 72 11ms 13 days ago First Prev 561–640 of 2,041 Next Last