The Calendar hole will go live in approximately 7 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 800th primo-ppcg 🇹🇭 716 72 37ms 21 Jun 2022 802nd MeWhenI 🇻🇦 716 89 41ms 28 Aug 2024 803rd ovs-code 🇩🇪 716 98 7ms 17 Mar 2023 804th Natanaelel 🇸🇪 715 32 52ms 22 Jul 2022 804th SirBogman 🇺🇸 715 32 47ms 10 Sep 2022 806th duckyluuk 🇳🇱 715 60 4,010ms 26 Oct 2024 807th DialFrost 🇸🇬 715 76 100ms 26 Dec 2024 807th snoozingnewt 🇨🇦 715 76 100ms 25 days ago 809th Yax42 🇫🇷 715 92 413ms 12 Nov 2025 810th Attero 🇸🇪 714 66 51ms 25 Sep 2020 810th nstearns96 🇬🇧 714 66 16ms 15 Dec 2022 812th jared-hughes 714 88 118ms 10 Nov 2022 812th kgodara 714 88 118ms 11 Mar 2023 812th snoozingnewt 🇨🇦 714 88 115ms 25 days ago 815th namelessiw 713 61 328ms 5 Mar 2024 815th lifthrasiir 🇰🇷 713 61 335ms 2 Dec 2024 815th DialFrost 🇸🇬 713 61 327ms 26 Dec 2024 818th Laar 712 81 137ms 1 Apr 2019 818th alomiF 712 81 136ms 5 Oct 2023 818th brimstonetrader 712 81 115ms 26 Jan 2024 821st MeWhenI 🇻🇦 711 92 5ms 2 Oct 2022 822nd Alex-x90 🇺🇸 711 97 58ms 4 Dec 2022 822nd Herbert00709 🇵🇱 711 97 52ms 8 Jun 2024 824th KenanSi 710 31 3ms 24 Feb 2022 824th ashtraypettingzoo 🇺🇸 710 31 3ms 5 Apr 2023 826th GrayJoKing 🇦🇺 706 70 10ms 20 Sep 2021 826th 0x24a537r9 706 70 12ms 10 Sep 2022 826th TRexOnGit 706 70 9ms 2 May 2025 826th Protothor 706 70 9ms 9 Jul 2025 830th jared-hughes 704 82 116ms 11 Sep 2023 831st msbranicky 704 185 10ms 29 Aug 2023 832nd Shanethegamer 🇺🇸 703 54 890ms 13 Sep 2021 833rd sean-niemann 🇺🇸 703 61 3,116ms 30 Oct 2024 833rd jkelly467 703 61 3,083ms 3 Nov 2025 835th itsjustfreekie 703 67 75ms 20 Sep 2021 835th Fishron 703 67 66ms 21 Oct 2021 835th fredrik-bakke 🇳🇴 703 67 72ms 29 Sep 2022 835th jakobkordez 🇸🇮 703 67 17ms 30 Oct 2022 835th jmerle 🇳🇱 703 67 74ms 16 Feb 2023 840th GrayJoKing 🇦🇺 703 72 1ms 9 Apr 2022 841st m-tkach 🇺🇦 703 98 59ms 9 Mar 2023 841st annaproxy 703 98 57ms 22 Oct 2023 843rd Yewzir 🇧🇪 702 62 349ms 4 Feb 2024 843rd ovs-code 🇩🇪 702 62 358ms 2 Mar 2024 843rd KatieLG 🇬🇧 702 62 372ms 28 Oct 2024 846th jmerle 🇳🇱 702 100 7ms 4 Jul 2023 847th saito-ta 🇯🇵 701 75 6ms 22 Jun 2022 847th inventshah 701 75 2ms 25 Jan 2023 847th Yewzir 🇧🇪 701 75 2ms 22 Dec 2023 847th KasperKivimaeki 🇫🇮 701 75 2ms 5 Jan 2025 851st dbut2 🇦🇺 701 121 274ms 15 Jul 2025 852nd MeWhenI 🇻🇦 700 69 2ms 10 Sep 2022 852nd Yewzir 🇧🇪 700 69 2ms 22 Dec 2023 852nd sean-niemann 🇺🇸 700 69 2ms 8 Oct 2024 852nd albanian-laundromat 700 69 2ms 24 Jun 2025 856th jared-hughes 700 94 444ms 24 Sep 2025 857th Bubbler-4 699 49 65ms 13 Sep 2023 857th ovs-code 🇩🇪 699 49 63ms 13 Sep 2023 859th JunkIce 698 90 116ms 23 Feb 2025 859th dokutan 698 90 123ms 23 Jul 2025 861st snoozingnewt 🇨🇦 697 89 365ms 25 days ago 862nd jared-hughes 696 71 9ms 29 Oct 2021 862nd stefangimmillaro 696 71 9ms 27 Aug 2022 862nd SirFireball3521 696 71 9ms 28 Jan 2023 862nd Maznek 696 71 9ms 19 Jun 2023 862nd KrausRaus 🇺🇸 696 71 9ms 14 Oct 2025 862nd snoozingnewt 🇨🇦 696 71 9ms 25 days ago 868th msbranicky 696 74 78ms 14 Aug 2023 869th Steffan153 🇫🇮 696 99 54ms 28 Jan 2023 869th ovs-code 🇩🇪 696 99 56ms 3 Jun 2024 869th roupiq 🇵🇱 696 99 57ms 8 Jun 2024 872nd dokutan 694 88 91ms 12 days ago 873rd MeWhenI 🇻🇦 694 133 1,642ms 7 Nov 2025 874th xorraxrax 693 68 9ms 19 Oct 2019 874th NewDefectus 🇮🇱 693 68 10ms 1 Nov 2020 874th ydevor 🇮🇱 693 68 9ms 26 Nov 2020 874th jacklynnepenick 693 68 42ms 17 Aug 2021 874th aposteriorist 🇨🇦 693 68 9ms 6 Feb 2022 874th PowerR0 693 68 9ms 25 Aug 2022 874th SB-945 693 68 16ms 31 Mar 2024 First Prev 801–880 of 3,123 Next Last