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 801st ovs-code 🇩🇪 716 98 7ms 17 Mar 2023 802nd Natanaelel 🇸🇪 715 32 69ms 22 Jul 2022 802nd SirBogman 🇺🇸 715 32 73ms 10 Sep 2022 804th duckyluuk 🇳🇱 715 60 4,255ms 26 Oct 2024 805th DialFrost 🇸🇬 715 76 100ms 26 Dec 2024 805th snoozingnewt 🇨🇦 715 76 100ms 19 days ago 807th Yax42 🇫🇷 715 92 413ms 12 Nov 2025 808th Attero 🇸🇪 714 66 51ms 25 Sep 2020 808th nstearns96 🇬🇧 714 66 16ms 15 Dec 2022 810th jared-hughes 714 88 118ms 10 Nov 2022 810th kgodara 714 88 118ms 11 Mar 2023 810th snoozingnewt 🇨🇦 714 88 115ms 19 days ago 813th namelessiw 713 61 328ms 5 Mar 2024 813th lifthrasiir 🇰🇷 713 61 335ms 2 Dec 2024 813th DialFrost 🇸🇬 713 61 327ms 26 Dec 2024 816th Laar 712 81 137ms 1 Apr 2019 816th alomiF 712 81 136ms 5 Oct 2023 816th brimstonetrader 712 81 115ms 26 Jan 2024 819th MeWhenI 🇻🇦 711 92 5ms 2 Oct 2022 820th Alex-x90 🇺🇸 711 97 82ms 4 Dec 2022 820th Herbert00709 🇵🇱 711 97 52ms 8 Jun 2024 822nd KenanSi 710 31 3ms 24 Feb 2022 822nd ashtraypettingzoo 🇺🇸 710 31 3ms 5 Apr 2023 824th GrayJoKing 🇦🇺 706 70 10ms 20 Sep 2021 824th 0x24a537r9 706 70 12ms 10 Sep 2022 824th TRexOnGit 706 70 9ms 2 May 2025 824th Protothor 706 70 9ms 9 Jul 2025 828th GrayJoKing 🇦🇺 705 72 1ms 9 Apr 2022 829th msbranicky 704 185 10ms 29 Aug 2023 830th Shanethegamer 🇺🇸 703 54 890ms 13 Sep 2021 831st sean-niemann 🇺🇸 703 61 4,187ms 30 Oct 2024 831st jkelly467 703 61 4,851ms 3 Nov 2025 833rd itsjustfreekie 703 67 75ms 20 Sep 2021 833rd Fishron 703 67 66ms 21 Oct 2021 833rd fredrik-bakke 🇳🇴 703 67 72ms 29 Sep 2022 833rd jakobkordez 🇸🇮 703 67 17ms 30 Oct 2022 833rd jmerle 🇳🇱 703 67 74ms 16 Feb 2023 838th jared-hughes 703 82 116ms 11 Sep 2023 839th m-tkach 🇺🇦 703 98 65ms 9 Mar 2023 839th annaproxy 703 98 74ms 22 Oct 2023 841st Yewzir 🇧🇪 702 62 349ms 4 Feb 2024 841st ovs-code 🇩🇪 702 62 358ms 2 Mar 2024 841st KatieLG 🇬🇧 702 62 372ms 28 Oct 2024 844th albanian-laundromat 702 87 109ms 19 days ago 845th jmerle 🇳🇱 702 100 7ms 4 Jul 2023 846th saito-ta 🇯🇵 701 75 6ms 22 Jun 2022 846th inventshah 701 75 2ms 25 Jan 2023 846th Yewzir 🇧🇪 701 75 2ms 22 Dec 2023 846th KasperKivimaeki 🇫🇮 701 75 2ms 5 Jan 2025 850th dbut2 🇦🇺 701 121 274ms 15 Jul 2025 851st MeWhenI 🇻🇦 700 69 2ms 10 Sep 2022 851st Yewzir 🇧🇪 700 69 2ms 22 Dec 2023 851st sean-niemann 🇺🇸 700 69 2ms 8 Oct 2024 851st albanian-laundromat 700 69 2ms 24 Jun 2025 855th jared-hughes 700 94 444ms 24 Sep 2025 856th Bubbler-4 699 49 72ms 13 Sep 2023 856th ovs-code 🇩🇪 699 49 63ms 13 Sep 2023 858th JunkIce 698 90 116ms 23 Feb 2025 858th dokutan 698 90 123ms 23 Jul 2025 860th snoozingnewt 🇨🇦 697 89 365ms 19 days ago 861st jared-hughes 696 71 9ms 29 Oct 2021 861st stefangimmillaro 696 71 9ms 27 Aug 2022 861st SirFireball3521 696 71 9ms 28 Jan 2023 861st Maznek 696 71 9ms 19 Jun 2023 861st KrausRaus 🇺🇸 696 71 9ms 14 Oct 2025 861st snoozingnewt 🇨🇦 696 71 9ms 19 days ago 867th msbranicky 696 74 78ms 14 Aug 2023 868th Steffan153 🇫🇮 696 99 81ms 28 Jan 2023 868th ovs-code 🇩🇪 696 99 70ms 3 Jun 2024 868th roupiq 🇵🇱 696 99 76ms 8 Jun 2024 871st dokutan 694 88 91ms 5 days ago 872nd MeWhenI 🇻🇦 694 133 1,642ms 7 Nov 2025 873rd xorraxrax 693 68 9ms 19 Oct 2019 873rd NewDefectus 🇮🇱 693 68 10ms 1 Nov 2020 873rd ydevor 🇮🇱 693 68 9ms 26 Nov 2020 873rd jacklynnepenick 693 68 42ms 17 Aug 2021 873rd aposteriorist 🇨🇦 693 68 9ms 6 Feb 2022 873rd PowerR0 693 68 9ms 25 Aug 2022 873rd SB-945 693 68 16ms 31 Mar 2024 873rd Troon 693 68 9ms 11 Feb 2025 First Prev 801–880 of 3,125 Next Last