The Calendar hole will go live in approximately 6 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 639th two-bad 🇬🇧 825 72 13ms 25 Feb 2024 639th KrausRaus 🇺🇸 825 72 13ms 14 Oct 2025 639th Lv0Sys 🇵🇱 825 72 11ms 20 days ago 644th MeWhenI 🇻🇦 824 53 141ms 19 Sep 2021 644th GrayJoKing 🇦🇺 824 53 76ms 20 Sep 2021 644th sean-niemann 🇺🇸 824 53 142ms 20 Sep 2021 644th scpchicken 🇵🇼 824 53 143ms 19 Dec 2022 644th Steffan153 🇫🇮 824 53 141ms 27 Jan 2023 644th DialFrost 🇸🇬 824 53 146ms 28 Jan 2023 644th snoozingnewt 🇨🇦 824 53 141ms 1 Sep 2024 644th fuzzylojik-golf 🇺🇸 824 53 95ms 15 Sep 2025 644th blaztoma 🇱🇹 824 53 141ms 23 Nov 2025 653rd andersk 🇺🇸 824 121 121ms 31 Oct 2022 654th Fishron 823 85 245ms 21 Oct 2021 654th aposteriorist 🇨🇦 823 85 20ms 6 Feb 2022 654th TFeld00 🇩🇰 823 85 364ms 22 Apr 2022 654th Ailko 🇧🇪 823 85 68ms 5 May 2022 654th tkr-sh 🇰🇵 823 85 20ms 17 May 2022 654th 051 🇸🇬 823 85 19ms 19 Aug 2022 654th trist224 🇫🇷 823 85 66ms 18 Oct 2022 654th Ripick 823 85 19ms 1 Feb 2023 654th jmerle 🇳🇱 823 85 293ms 16 Feb 2023 654th fkantelberg 823 85 19ms 7 Aug 2023 654th minhtrancccp 823 85 58ms 1 Nov 2023 654th wen1now 823 85 19ms 6 Nov 2023 654th elgan65536 823 85 20ms 28 Nov 2023 654th stertooy 🇧🇪 823 85 19ms 14 Jun 2024 654th FranklinJiaChen 823 85 192ms 5 Aug 2024 654th keelimeguy 🇺🇸 823 85 234ms 17 May 2025 654th KasperKivimaeki 🇫🇮 823 85 20ms 2 Jul 2025 654th albanian-laundromat 823 85 19ms 20 Nov 2025 654th Lv0Sys 🇵🇱 823 85 28ms 20 days ago 673rd sean-niemann 🇺🇸 822 86 3,273ms 30 Oct 2024 674th jared-hughes 821 83 126ms 11 Sep 2023 675th Shanethegamer 🇺🇸 821 168 467ms 27 Mar 2025 676th AdrienHache 🇫🇷 820 94 378ms 2 Jun 2023 677th Yewzir 🇧🇪 819 107 40ms 14 Jan 2024 678th Shanethegamer 🇺🇸 818 101 458ms 13 Apr 2023 678th emgordon154 818 101 461ms 26 May 2025 680th snoozingnewt 🇨🇦 817 66 13ms 1 Sep 2024 680th LostSyntax21 🇬🇧 817 66 4ms 8 Jan 2025 682nd dokutan 817 82 568ms 24 Dec 2024 683rd snyderek 🇺🇸 817 116 59ms 6 Oct 2024 684th m-tkach 🇺🇦 817 120 28ms 18 Dec 2023 685th Mabeloid 🇳🇴 817 122 122ms 31 Oct 2025 685th CaedenHarper 🇨🇦 817 122 122ms 23 days ago 687th edsrzf 🇳🇿 816 88 11ms 7 Jun 2025 688th Natanaelel 🇸🇪 815 33 76ms 22 Jul 2022 688th SirBogman 🇺🇸 815 33 73ms 10 Sep 2022 690th snoozingnewt 🇨🇦 815 105 81ms 30 Sep 2025 691st kimbo 🇺🇸 815 146 265ms 12 Jan 2023 692nd janbehrens 🇩🇪 814 73 10ms 20 Sep 2021 692nd didion0 🇺🇸 814 73 41ms 23 Nov 2021 692nd KatieLG 🇬🇧 814 73 14ms 5 Apr 2022 692nd emgordon154 814 73 10ms 7 Nov 2024 696th MeWhenI 🇻🇦 813 71 65ms 5 Apr 2025 697th andre-lameirinhas 🇵🇹 813 86 189ms 4 Nov 2021 697th RYNO8 813 86 61ms 16 Aug 2022 697th LeeCamp 813 86 229ms 15 Jan 2023 697th vishwathg 813 86 334ms 4 Feb 2023 697th cros107 🇦🇺 813 86 242ms 11 Oct 2023 697th logvp 813 86 3,236ms 12 Jan 2024 697th Bmrl7 813 86 12ms 29 Feb 2024 697th Grrisly 813 86 279ms 29 Mar 2024 697th SB-945 813 86 19ms 31 Mar 2024 697th resoNathan 813 86 13ms 18 Jul 2024 697th Andrey2001 813 86 13ms 20 days ago 708th Shanethegamer 🇺🇸 813 100 118ms 19 Sep 2021 708th MichalMarsalek 🇨🇿 813 100 125ms 3 Mar 2022 710th KenanSi 812 32 6ms 24 Feb 2022 710th ashtraypettingzoo 🇺🇸 812 32 6ms 5 Apr 2023 712th ovs-code 🇩🇪 812 66 11ms 15 Aug 2024 712th sisyphus-ppcg 🇦🇺 812 66 14ms 19 Aug 2024 714th OhmNomNom 811 59 38ms 20 Oct 2022 714th AlephSquirrel 811 59 74ms 14 Apr 2023 714th SirBogman 🇺🇸 811 59 76ms 10 Jan 2024 714th error256 811 59 52ms 13 May 2024 718th AlephSquirrel 810 104 4ms 6 Aug 2024 719th GolfingSuccess 🇬🇷 810 117 62ms 19 Mar 2025 720th elgan65536 810 123 124ms 5 Mar 2024 First Prev 641–720 of 2,042 Next Last