The Calendar hole will go live in approximately 9 days. Why not try and solve it ahead of time?
Happy Numbers 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 881st primo-ppcg 🇹🇭 829 67 89ms 25 Dec 2020 881st lynn 829 67 116ms 18 May 2021 881st Yewzir 🇧🇪 829 67 98ms 17 Sep 2023 881st sean-niemann 🇺🇸 829 67 95ms 8 Oct 2024 885th jared-hughes 829 82 116ms 11 Sep 2023 886th anter69 🇭🇺 828 57 34ms 3 Aug 2021 886th annaproxy 828 57 37ms 27 Aug 2022 886th BREMAUCY 🇫🇷 828 57 38ms 26 Mar 2024 889th inventshah 827 80 2ms 9 Sep 2022 890th Shanethegamer 🇺🇸 826 64 3ms 25 Apr 2023 891st m-tkach 🇺🇦 825 64 323ms 30 Jan 2024 892nd dokutan 825 101 500ms 24 Sep 2025 893rd didion0 🇺🇸 822 73 12ms 22 Apr 2021 893rd itsh01 822 73 12ms 16 Aug 2021 893rd c0d3-4-F00d 🇩🇪 822 73 9ms 5 Jan 2022 893rd DaCuteRaccoon 822 73 9ms 30 Nov 2022 893rd janbehrens 🇩🇪 822 73 9ms 17 Jun 2023 893rd Yax42 🇫🇷 822 73 9ms 12 Nov 2025 899th ovs-code 🇩🇪 822 153 1,750ms 14 Sep 2025 899th primo-ppcg 🇹🇭 822 153 1,708ms 15 Sep 2025 899th emgordon154 822 153 1,662ms 16 Sep 2025 899th Yewzir 🇧🇪 822 153 2,377ms 14 Nov 2025 903rd KatieLG 🇬🇧 821 74 16ms 5 Nov 2020 903rd trist224 🇫🇷 821 74 9ms 15 Nov 2022 903rd QuincyNash 🇺🇸 821 74 9ms 29 Nov 2022 906th snoozingnewt 🇨🇦 820 74 4,501ms 23 days ago 907th AaronGarbut 820 87 1ms 30 Jul 2019 908th MeWhenI 🇻🇦 820 98 41ms 28 Aug 2024 909th phdphil 818 46 178ms 9 Apr 2018 910th dokutan 818 85 101ms 23 Jul 2025 911th orthoplex 🇨🇽 817 36 35ms 20 Jul 2024 912th snoozingnewt 🇨🇦 817 68 85ms 23 days ago 913th Frank-Buss 817 93 5ms 29 Aug 2020 914th jared-hughes 817 154 1,691ms 16 Sep 2025 914th MeWhenI 🇻🇦 817 154 1,642ms 7 Nov 2025 916th NewDefectus 🇮🇱 813 54 14ms 15 Dec 2021 917th Waffle3z 813 58 37ms 20 Jan 2021 917th jbbarth 🇫🇷 813 58 47ms 8 Oct 2021 917th AlephSquirrel 813 58 54ms 14 Apr 2023 917th SirBogman 🇺🇸 813 58 42ms 10 Jan 2024 917th fuzzylojik-golf 🇺🇸 813 58 35ms 3 Sep 2025 922nd MeWhenI 🇻🇦 813 71 3ms 25 Jul 2023 922nd GrayJoKing 🇦🇺 813 71 133ms 3 Aug 2024 924th dokutan 813 100 123ms 23 Jul 2025 925th MeWhenI 🇻🇦 812 65 357ms 17 Jan 2024 925th Babafaba 812 65 338ms 4 Nov 2025 927th tomtheisen 🇺🇸 811 74 9ms 9 Oct 2020 927th weliveinhell 🇭🇹 811 74 9ms 3 Sep 2023 927th thisishowmymindworks 🇳🇴 811 74 14ms 10 Jun 2024 930th rucin93 🇵🇱 811 85 2ms 19 Nov 2025 931st ListeriaM 811 88 2ms 25 Aug 2023 931st Jonatan6 🇩🇰 811 88 2ms 27 Apr 2024 933rd mortimervonchappuis 810 75 10ms 17 Mar 2020 933rd SirFireball3521 810 75 10ms 28 Jan 2023 933rd AlexanderFair 810 75 9ms 2 Jul 2023 933rd msbranicky 810 75 9ms 25 Jul 2023 937th snoozingnewt 🇨🇦 810 78 5ms 23 days ago 938th Natanaelel 🇸🇪 809 32 69ms 22 Jul 2022 938th SirBogman 🇺🇸 809 32 73ms 10 Sep 2022 940th primo-ppcg 🇹🇭 808 61 79ms 9 Feb 2022 941st janbehrens 🇩🇪 807 82 2ms 26 Nov 2023 942nd KenanSi 806 31 3ms 24 Feb 2022 942nd ashtraypettingzoo 🇺🇸 806 31 3ms 5 Apr 2023 944th DialFrost 🇸🇬 805 62 60ms 21 Jan 2025 945th primo-ppcg 🇹🇭 804 102 25ms 25 Jun 2022 946th MeWhenI 🇻🇦 802 72 124ms 3 Aug 2024 947th Yewzir 🇧🇪 802 86 2ms 19 Nov 2025 948th AlexDaniel 🇪🇪 801 47 207ms 5 Apr 2020 948th SirBogman 🇺🇸 801 47 200ms 4 Nov 2021 950th jared-hughes 801 104 444ms 24 Sep 2025 951st adoxography 800 59 36ms 22 Jul 2018 951st flavono123 800 59 47ms 19 Dec 2019 951st rbviz 800 59 36ms 29 Mar 2021 951st Shanethegamer 🇺🇸 800 59 42ms 13 Sep 2021 951st OhmNomNom 800 59 44ms 13 Oct 2022 951st tatzyr 🇯🇵 800 59 48ms 5 Apr 2025 957th lynn 800 66 323ms 17 Feb 2024 958th Unremarkable 800 75 9ms 28 Sep 2018 958th ToriTheChicken 800 75 9ms 24 Jul 2020 958th ehouais 800 75 8ms 24 Aug 2020 First Prev 881–960 of 3,141 Next Last