The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
Happy Numbers in all languages in chars. 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 Chars Time Submitted 560th benwilliamgraham 799 59 9ms 26 Jan 2019 560th mogron 799 59 9ms 13 Dec 2019 560th mortimervonchappuis 799 59 10ms 17 Mar 2020 560th OllieBoyne 🇬🇧 799 59 9ms 16 Jan 2021 560th SnowballSH 799 59 9ms 31 Jan 2021 560th vishwathg 799 59 9ms 16 Aug 2022 560th StefanHabel 🇨🇦 799 59 9ms 11 Dec 2022 560th emirps 799 59 9ms 22 Feb 2023 560th AlexanderFair 799 59 9ms 2 Jul 2023 560th AVDestroyer 799 59 9ms 4 Sep 2023 560th eiburns 799 59 9ms 13 Sep 2023 560th m42km 799 59 9ms 7 Oct 2023 560th elgan65536 799 59 16ms 4 Apr 2024 560th KasperKivimaeki 🇫🇮 799 59 10ms 5 Jul 2025 560th dirckvdende 799 59 9ms 6 Jul 2025 576th clockworknazo 798 82 4ms 13 Oct 2022 576th ovs-code 🇩🇪 798 82 5ms 7 Feb 2023 578th emplv 🇱🇻 797 62 10ms 15 Dec 2021 578th rucin93 🇵🇱 797 62 9ms 19 Apr 2024 578th vlpx 🇫🇮 797 62 10ms 18 Jun 2024 581st SirFireball3521 796 39 199ms 22 Mar 2023 582nd primo-ppcg 🇹🇭 796 70 38ms 4 Jan 2024 582nd stefangimmillaro 796 70 38ms 14 Jan 2024 584th MeWhenI 🇻🇦 795 44 3ms 12 Aug 2024 584th sisyphus-ppcg 🇦🇺 795 44 3ms 12 Aug 2024 584th DialFrost 🇸🇬 795 44 4ms 15 Aug 2024 584th ovs-code 🇩🇪 795 44 3ms 15 Aug 2024 584th Shanethegamer 🇺🇸 795 44 4ms 15 Aug 2024 584th GrayJoKing 🇦🇺 795 44 3ms 17 Aug 2024 584th emgordon154 795 44 3ms 19 Aug 2024 584th pardouin 🇫🇷 795 44 3ms 6 Sep 2024 584th sean-niemann 🇺🇸 795 44 3ms 13 Jan 2025 584th snoozingnewt 🇨🇦 795 44 4ms 18 days ago 594th Yewzir 🇧🇪 792 54 6ms 14 Dec 2023 594th dokutan 792 54 5ms 19 May 2024 594th emgordon154 792 54 5ms 5 Dec 2024 594th edsrzf 🇳🇿 792 54 6ms 21 Jan 2025 594th kg583 🇺🇸 792 54 7ms 30 Jul 2025 594th snoozingnewt 🇨🇦 792 54 7ms 17 days ago 600th neel11235813 791 55 378ms 10 Mar 2024 600th albanian-laundromat 791 55 405ms 7 Oct 2025 602nd flawr 790 73 136ms 24 Feb 2019 602nd GrayJoKing 🇦🇺 790 73 136ms 5 Dec 2020 602nd Shanethegamer 🇺🇸 790 73 140ms 15 Jul 2021 602nd yzhs 🇩🇪 790 73 140ms 24 Jul 2021 602nd MeWhenI 🇻🇦 790 73 144ms 15 Sep 2021 602nd sisyphus-ppcg 🇦🇺 790 73 140ms 16 Mar 2022 602nd DaCuteRaccoon 790 73 136ms 30 Nov 2022 602nd DialFrost 🇸🇬 790 73 154ms 28 Jan 2023 602nd scpchicken 🇵🇼 790 73 140ms 7 Mar 2023 602nd pardouin 🇫🇷 790 73 177ms 21 Sep 2024 602nd LostSyntax21 🇬🇧 790 73 152ms 8 Jan 2025 602nd snoozingnewt 🇨🇦 790 73 148ms 13 days ago 614th Yewzir 🇧🇪 787 69 97ms 6 Dec 2023 615th MeWhenI 🇻🇦 787 93 1ms 18 May 2022 616th lifthrasiir 🇰🇷 786 28 3ms 29 Nov 2024 617th sisyphus-ppcg 🇦🇺 786 108 278ms 16 Mar 2022 618th stevelamm 785 60 9ms 5 Oct 2018 618th tjtnorton 785 60 9ms 29 Nov 2018 618th giacomogallina 785 60 9ms 14 Jun 2019 618th cellobix 785 60 9ms 14 Aug 2019 618th mizuzimu 785 60 9ms 4 Feb 2020 618th ArmaanAS 785 60 9ms 8 Mar 2021 618th RDShah 785 60 9ms 26 Nov 2021 618th QuincyNash 🇺🇸 785 60 9ms 30 Nov 2022 618th msbranicky 785 60 9ms 25 Jul 2023 618th Hebelub 785 60 9ms 5 Jan 2024 618th dokutan 785 60 9ms 23 Jan 2024 618th wh3n3v3r 🇨🇿 785 60 9ms 16 Nov 2024 618th JunkIce 785 60 9ms 23 Feb 2025 618th ffelixm 785 60 12ms 12 Jun 2025 618th RaBa21 🇭🇺 785 60 9ms 10 Jul 2025 618th Flekay 🇩🇪 785 60 9ms 10 Jul 2025 634th dmrichwa 🇺🇸 784 63 10ms 28 Jan 2023 634th targrik 784 63 10ms 19 Feb 2025 636th GrayJoKing 🇦🇺 784 67 4ms 31 Jan 2025 637th inventshah 783 88 80ms 27 Jan 2023 638th hemphen 782 69 366ms 28 Aug 2022 639th jslip 781 35 33ms 5 Sep 2018 639th rak1507 🇬🇧 781 35 34ms 20 Sep 2021 First Prev 561–640 of 3,125 Next Last