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 874th Troon 693 68 9ms 11 Feb 2025 882nd sisyphus-ppcg 🇦🇺 692 43 2ms 3 Nov 2020 882nd pandapawskat 692 43 1ms 20 Sep 2021 882nd stefangimmillaro 692 43 2ms 23 Apr 2022 885th o0lit3 🇺🇸 692 50 10ms 19 Apr 2021 885th armin-k1 692 50 8ms 8 Sep 2021 887th Alex-x90 🇺🇸 692 76 2ms 3 Dec 2022 888th snoozingnewt 🇨🇦 692 95 356ms 25 days ago 889th anter69 🇭🇺 691 55 1,011ms 10 Mar 2025 890th GrayJoKing 🇦🇺 691 61 117ms 13 Mar 2022 891st btnlq 691 63 3ms 15 Jul 2023 891st SirBogman 🇺🇸 691 63 335ms 15 Jan 2024 891st GolfingSuccess 🇬🇷 691 63 375ms 30 Jan 2024 894th JDiLenarda 🇫🇷 690 61 1,227ms 9 Oct 2020 895th inventshah 690 70 2ms 9 Sep 2022 896th labster 689 45 100ms 23 Feb 2018 896th snoozingnewt 🇨🇦 689 45 115ms 23 days ago 898th jared-hughes 689 100 53ms 20 Jul 2022 899th gnuvince 688 32 10ms 2 Aug 2024 899th codereport 🇨🇦 688 32 3ms 21 Apr 2025 901st MeWhenI 🇻🇦 688 75 35ms 20 Jun 2022 902nd marshallward 🇺🇸 688 81 39ms 2 Sep 2022 903rd JayXon 🇺🇸 688 102 7ms 15 Mar 2023 904th PatrickStephansen 🇿🇦 686 72 10ms 3 Nov 2020 904th KatieLG 🇬🇧 686 72 10ms 16 Apr 2021 904th neihousaigaai 686 72 10ms 18 Apr 2021 904th two-bad 🇬🇧 686 72 10ms 25 Feb 2024 908th rustyflamingo 685 49 500ms 22 Sep 2022 908th antimon2 🇯🇵 685 49 600ms 15 Oct 2022 908th alemelis 685 49 532ms 1 Mar 2023 908th HPWiz 🇳🇿 685 49 508ms 9 Mar 2023 908th ovs-code 🇩🇪 685 49 554ms 24 Oct 2023 908th MarcMush 🇫🇷 685 49 551ms 5 Jan 2024 908th DialFrost 🇸🇬 685 49 488ms 5 Jan 2024 908th twolfive 685 49 556ms 5 Oct 2024 916th DialFrost 🇸🇬 685 93 36ms 16 Feb 2025 917th galloj 🇨🇿 684 107 1ms 28 Aug 2022 918th j-Ewan 683 40 33ms 22 Feb 2022 919th Espiobest 683 69 16ms 26 Feb 2021 919th cbondurant 683 69 9ms 10 May 2021 919th hellwue 683 69 9ms 8 Feb 2023 919th Vaekor 683 69 9ms 9 Jul 2023 919th jatloe 683 69 75ms 27 Sep 2024 924th sean-niemann 🇺🇸 683 77 2ms 29 Nov 2022 925th MeWhenI 🇻🇦 683 101 55ms 8 May 2022 925th janbehrens 🇩🇪 683 101 52ms 26 Nov 2023 927th retrohun 682 191 10ms 27 Dec 2022 928th sisyphus-ppcg 🇦🇺 681 67 5ms 2 Jul 2023 928th targrik 681 67 4ms 17 Jul 2025 930th m-tkach 🇺🇦 680 64 323ms 30 Jan 2024 931st MeWhenI 🇻🇦 679 62 118ms 11 Nov 2021 932nd Irratix 🇳🇱 678 56 1,042ms 25 Mar 2021 932nd emgordon154 678 56 911ms 18 Nov 2024 934th emplv 🇱🇻 678 63 131ms 17 Jul 2025 935th didion0 🇺🇸 677 73 12ms 22 Apr 2021 935th itsh01 677 73 12ms 16 Aug 2021 935th c0d3-4-F00d 🇩🇪 677 73 9ms 5 Jan 2022 935th DaCuteRaccoon 677 73 9ms 30 Nov 2022 935th inventshah 677 73 8ms 28 Jan 2023 935th Yax42 🇫🇷 677 73 9ms 12 Nov 2025 941st primo-ppcg 🇹🇭 677 105 1ms 3 Oct 2020 942nd primo-ppcg 🇹🇭 676 57 4ms 27 Apr 2023 942nd GrayJoKing 🇦🇺 676 57 4ms 20 Aug 2023 942nd emgordon154 676 57 4ms 10 Jan 2025 942nd sean-niemann 🇺🇸 676 57 3ms 21 Apr 2025 942nd kg583 🇺🇸 676 57 3ms 26 Sep 2025 942nd edsrzf 🇳🇿 676 57 4ms 26 Sep 2025 948th Attero 🇸🇪 675 46 150ms 4 May 2020 949th annaproxy 675 80 317ms 5 May 2022 949th Yewzir 🇧🇪 675 80 306ms 8 May 2023 949th DialFrost 🇸🇬 675 80 348ms 26 Dec 2024 952nd marcin7Cd 674 78 2ms 17 May 2020 952nd lynn 674 78 2ms 2 Oct 2021 952nd Steffan153 🇫🇮 674 78 2ms 28 Jan 2023 952nd AZTECCO 674 78 2ms 16 Sep 2025 956th gilufin 673 70 74ms 23 May 2021 956th kellantech 673 70 9ms 3 Jun 2023 956th 2011-Chan-Ethan 673 70 79ms 12 Jul 2023 956th Dataen 673 70 9ms 5 Jan 2024 956th katss2 673 70 12ms 14 Aug 2025 First Prev 881–960 of 3,123 Next Last