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 481st Shanethegamer 🇺🇸 860 98 5ms 20 Dec 2024 482nd DialFrost 🇸🇬 858 58 1,134ms 13 Apr 2025 483rd GrayJoKing 🇦🇺 857 105 44ms 12 Mar 2022 484th MeWhenI 🇻🇦 856 51 20ms 15 Feb 2025 485th edsrzf 🇳🇿 856 139 268ms 23 Oct 2024 486th ovs-code 🇩🇪 855 89 12ms 30 Jun 2024 487th Shanethegamer 🇺🇸 855 110 447ms 25 Sep 2025 487th Yewzir 🇧🇪 855 110 446ms 2 Oct 2025 487th CaedenHarper 🇨🇦 855 110 480ms 5 Nov 2025 487th MeWhenI 🇻🇦 855 110 427ms 7 Nov 2025 491st akshatj27 🇦🇶 854 56 34ms 11 Jan 2022 491st Steffan153 🇫🇮 854 56 57ms 16 Dec 2022 491st m-tkach 🇺🇦 854 56 39ms 23 Feb 2023 494th MeWhenI 🇻🇦 854 72 85ms 13 Dec 2022 495th CLOStrophobic 🇮🇹 854 116 506ms 10 Feb 2025 496th MeWhenI 🇻🇦 853 77 64ms 19 Sep 2021 496th snoozingnewt 🇨🇦 853 77 65ms 16 Oct 2025 498th SirBogman 🇺🇸 853 82 211ms 21 Sep 2021 498th stefangimmillaro 853 82 307ms 27 Sep 2021 498th NewDefectus 🇮🇱 853 82 19ms 16 Dec 2021 498th CedricGebistorf 853 82 220ms 25 Feb 2022 498th Shanethegamer 🇺🇸 853 82 300ms 16 Dec 2022 498th aksyristos 853 82 195ms 12 Feb 2023 498th quimey 853 82 205ms 22 Mar 2023 498th StefanHabel 🇨🇦 853 82 302ms 26 Mar 2023 498th Fracture17 853 82 271ms 8 Apr 2023 498th Re-Adventures 🇮🇳 853 82 222ms 20 Jul 2023 498th Natanaelel 🇸🇪 853 82 213ms 29 Oct 2023 498th Just4FunCoder 853 82 289ms 17 Feb 2024 498th codingisgreatbutiamnot 853 82 292ms 25 Jul 2024 498th lifthrasiir 🇰🇷 853 82 13ms 13 Nov 2024 498th klixel 🇨🇦 853 82 292ms 17 Jan 2025 498th blaztoma 🇱🇹 853 82 250ms 15 Nov 2025 498th CommandLeo 🇮🇹 853 82 298ms 15 days ago 498th luuumine 🇫🇷 853 82 303ms 14 days ago 498th FortuiteMan 🇫🇷 853 82 290ms 13 days ago 517th duckyluuk 🇳🇱 853 88 28ms 12 Dec 2024 517th GolfingSuccess 🇬🇷 853 88 22ms 11 Sep 2025 519th emplv 🇱🇻 853 148 24ms 29 Jun 2022 520th marcin7Cd 852 80 146ms 29 Sep 2021 520th cbrt-x 852 80 154ms 15 Sep 2023 522nd primo-ppcg 🇹🇭 852 82 1ms 22 Sep 2021 522nd nwellnhof 🇩🇪 852 82 2ms 22 Sep 2021 522nd Attero 🇸🇪 852 82 3ms 23 Dec 2021 522nd c0d3-4-F00d 🇩🇪 852 82 3ms 5 Jan 2022 522nd snoozingnewt 🇨🇦 852 82 3ms 13 Sep 2025 527th inventshah 852 83 3,973ms 24 Oct 2024 527th aditsu 852 83 4,335ms 10 Aug 2025 529th Lydxn 🇨🇦 852 90 40ms 20 Sep 2021 529th Steffan153 🇫🇮 852 90 40ms 12 Jan 2023 529th stefangimmillaro 852 90 40ms 26 Jan 2023 529th MeWhenI 🇻🇦 852 90 41ms 14 May 2023 529th DialFrost 🇸🇬 852 90 41ms 22 Oct 2024 534th lynn 852 115 28ms 21 Aug 2023 535th The3gs 852 117 129ms 29 Nov 2024 536th snoozingnewt 🇨🇦 851 99 4ms 1 Sep 2024 537th janbehrens 🇩🇪 850 140 268ms 20 Sep 2021 538th KatieLG 🇬🇧 848 79 544ms 16 Jan 2024 538th MeWhenI 🇻🇦 848 79 494ms 17 Jan 2024 538th duckyluuk 🇳🇱 848 79 499ms 20 Jun 2024 538th namelessiw 848 79 483ms 14 Jul 2024 538th lifthrasiir 🇰🇷 848 79 512ms 2 Dec 2024 543rd MeWhenI 🇻🇦 847 96 126ms 15 Nov 2022 544th stefangimmillaro 847 111 528ms 6 Oct 2025 544th kmathis22 847 111 403ms 20 Nov 2025 544th ethanlally 847 111 366ms 25 days ago 544th dokutan 847 111 411ms 24 days ago 544th snoozingnewt 🇨🇦 847 111 387ms 12 days ago 549th ovs-code 🇩🇪 847 190 18ms 9 Jul 2024 550th Steffan153 🇫🇮 846 89 17ms 3 Feb 2023 550th sisyphus-ppcg 🇦🇺 846 89 18ms 4 Feb 2023 550th edsrzf 🇳🇿 846 89 13ms 14 Nov 2025 553rd Steffan153 🇫🇮 846 99 12ms 12 Dec 2023 554th Irratix 🇳🇱 846 112 61ms 3 Jan 2022 555th MeWhenI 🇻🇦 846 163 565ms 28 Mar 2025 556th rucin93 🇵🇱 845 86 2ms 19 Nov 2025 557th Yewzir 🇧🇪 845 118 127ms 5 Feb 2024 558th rak1507 🇬🇧 844 36 36ms 20 Sep 2021 559th ovs-code 🇩🇪 844 181 1,738ms 14 Sep 2025 559th jared-hughes 844 181 1,666ms 16 Sep 2025 First Prev 481–560 of 2,041 Next Last