The Calendar hole will go live in approximately 5 days. Why not try and solve it ahead of time?
Happy Numbers (Long) 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 878th Glinte 752 93 390ms 11 Dec 2023 878th Hebelub 752 93 13ms 5 Jan 2024 878th tobeannouncd 752 93 18ms 25 Apr 2025 878th YAJUE114514 752 93 403ms 28 Jul 2025 885th trist224 🇫🇷 752 126 397ms 15 Nov 2022 886th janbehrens 🇩🇪 751 64 490ms 9 Nov 2021 887th KrausRaus 🇺🇸 750 97 2ms 24 Oct 2023 888th Shanethegamer 🇺🇸 749 102 3ms 12 Dec 2022 888th dokutan 749 102 3ms 6 Nov 2025 890th 386asm 🇺🇸 749 117 40ms 10 Apr 2023 891st dokutan 748 103 369ms 23 Nov 2025 892nd Shanethegamer 🇺🇸 748 131 28ms 20 Mar 2023 893rd Irratix 🇳🇱 747 64 38ms 4 Mar 2022 893rd annaproxy 747 64 66ms 27 Aug 2022 895th CatsAreFluffy 746 66 4,537ms 31 Jan 2023 896th albanian-laundromat 746 113 4ms 16 days ago 897th Yewzir 🇧🇪 745 111 472ms 13 Jan 2024 898th drochom 744 94 327ms 22 Jun 2024 898th martion2007 744 94 68ms 14 Aug 2024 900th akamayu-ouo 🇹🇼 743 35 5ms 30 Jul 2024 901st jared-hughes 743 94 2ms 14 Mar 2022 901st Shanethegamer 🇺🇸 743 94 2ms 18 Dec 2022 901st KenanHanke 743 94 2ms 22 Feb 2023 901st Yewzir 🇧🇪 743 94 2ms 10 Jan 2024 905th KatieLG 🇬🇧 742 67 971ms 21 Sep 2021 906th itsh01 742 80 40ms 4 Oct 2021 906th voytxt 🇨🇿 742 80 11ms 2 Mar 2022 906th dokutan 742 80 22ms 24 Dec 2024 909th j-Ewan 741 41 33ms 22 Feb 2022 910th boxjelly 741 92 164ms 14 Mar 2022 911th primo-ppcg 🇹🇭 741 104 339ms 21 Nov 2021 911th Irratix 🇳🇱 741 104 350ms 13 Dec 2021 911th ericlangedijk 🇸🇮 741 104 376ms 17 Mar 2022 911th Matgc04 741 104 353ms 22 Aug 2023 911th CaedenHarper 🇨🇦 741 104 337ms 5 Nov 2025 916th jared-hughes 741 128 69ms 20 Jul 2022 916th Alex-x90 🇺🇸 741 128 62ms 14 Nov 2022 918th Shanethegamer 🇺🇸 738 89 41ms 16 Apr 2024 919th olivermrose 🇺🇸 736 65 40ms 27 Oct 2021 919th KatieLG 🇬🇧 736 65 38ms 10 Apr 2022 919th yzhs 🇩🇪 736 65 39ms 20 Jul 2022 919th DialFrost 🇸🇬 736 65 80ms 28 Jan 2023 919th edsrzf 🇳🇿 736 65 95ms 5 Nov 2024 924th AkashTandon167 736 95 67ms 2 Nov 2021 924th mhenion8293 🇺🇸 736 95 11ms 23 Jan 2022 924th 4ndyJ 🇬🇧 736 95 21ms 12 Feb 2023 924th Alex-x90 🇺🇸 736 95 19ms 13 Feb 2023 924th AlephSquirrel 736 95 2ms 8 Jun 2023 924th mathb0y512 736 95 488ms 22 Sep 2025 924th jacekwladzinski 736 95 19ms 2 Oct 2025 931st SirBogman 🇺🇸 736 254 43ms 23 Nov 2022 932nd snoozingnewt 🇨🇦 735 114 14ms 30 Sep 2025 933rd jerrandolph 735 162 265ms 3 Nov 2023 934th arctouch-cristiannevianna 734 105 386ms 26 May 2023 934th annaproxy 734 105 396ms 11 Apr 2025 936th yokasuretsu 733 51 174ms 16 Nov 2021 937th MeWhenI 🇻🇦 733 68 1,713ms 28 Jan 2023 937th Feniske 🇫🇷 733 68 1,587ms 7 Nov 2023 939th AlephSquirrel 733 81 10ms 8 Aug 2022 940th snoozingnewt 🇨🇦 733 136 136ms 29 Sep 2025 941st snoozingnewt 🇨🇦 732 84 93ms 22 Oct 2025 942nd dokutan 732 109 105ms 18 Nov 2025 943rd GrayJoKing 🇦🇺 732 113 407ms 28 Feb 2022 944th snoozingnewt 🇨🇦 731 105 38ms 1 Sep 2024 945th Yewzir 🇧🇪 730 90 47ms 14 Jan 2024 946th pascscha 729 96 19ms 28 Mar 2022 946th vhoulbreque 🇫🇷 729 96 358ms 13 Aug 2022 946th Fanrco 729 96 308ms 4 Sep 2023 946th Europe2048 729 96 20ms 24 Nov 2024 950th Schmitt-Very-Cool 729 129 425ms 30 Sep 2025 951st scpchicken 🇵🇼 728 137 152ms 19 May 2022 952nd targrik 726 164 268ms 30 Jun 2025 953rd albanian-laundromat 726 190 484ms 18 Oct 2025 954th pandapawskat 725 66 37ms 7 Oct 2021 955th annaproxy 725 105 25ms 8 Jan 2023 956th randolchance 724 82 11ms 11 Jan 2023 957th MeWhenI 🇻🇦 724 118 41ms 13 Feb 2025 958th Shanethegamer 🇺🇸 724 121 36ms 15 Dec 2022 959th DialFrost 🇸🇬 723 110 97ms 16 Nov 2024 960th emgordon154 722 36 7ms 3 Nov 2024 First Prev 881–960 of 2,046 Next Last