The Calendar hole will go live in approximately 6 days. Why not try and solve it ahead of time?
Happy Numbers (Long) 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 481st rak1507 🇬🇧 834 36 36ms 20 Sep 2021 481st Steffan153 🇫🇮 834 36 235ms 16 Dec 2022 481st ovs-code 🇩🇪 834 36 220ms 31 Dec 2023 484th primo-ppcg 🇹🇭 834 91 2ms 23 Sep 2021 484th JayXon 🇺🇸 834 91 2ms 3 Oct 2021 484th Lydxn 🇨🇦 834 91 2ms 9 Apr 2022 484th btnlq 834 91 2ms 27 Dec 2022 488th Shanethegamer 🇺🇸 833 102 1,305ms 20 Mar 2023 489th Yewzir 🇧🇪 832 87 2ms 20 Nov 2025 490th primo-ppcg 🇹🇭 832 91 127ms 2 Apr 2022 490th Ripick 832 91 130ms 1 Feb 2023 492nd rucin93 🇵🇱 831 64 126ms 6 Sep 2024 493rd stackofbears 831 99 460ms 21 Mar 2022 494th albanian-laundromat 831 105 40ms 7 Sep 2025 495th Shanethegamer 🇺🇸 828 31 6ms 13 Jan 2022 496th pardouin 🇫🇷 828 83 3ms 8 Oct 2024 496th LostSyntax21 🇬🇧 828 83 3ms 8 Jan 2025 498th Shanethegamer 🇺🇸 828 114 56ms 18 Dec 2022 498th Yewzir 🇧🇪 828 114 57ms 14 Jan 2024 500th Shanethegamer 🇺🇸 828 120 123ms 13 Jan 2022 500th MeWhenI 🇻🇦 828 120 126ms 9 May 2023 500th emgordon154 828 120 123ms 14 Mar 2025 503rd ovs-code 🇩🇪 828 166 448ms 29 Mar 2025 503rd emgordon154 828 166 435ms 21 May 2025 505th MeWhenI 🇻🇦 827 91 119ms 5 Sep 2023 506th prplz 🇦🇺 827 103 122ms 18 Dec 2021 506th dokutan 827 103 84ms 6 Nov 2025 508th albanian-laundromat 825 73 749ms 23 Sep 2025 509th GrayJoKing 🇦🇺 824 50 106ms 19 Sep 2021 509th janlelis 824 50 108ms 20 Sep 2021 509th JayXon 🇺🇸 824 50 100ms 28 Sep 2021 509th sisyphus-ppcg 🇦🇺 824 50 339ms 6 May 2022 509th radarek 🇵🇱 824 50 103ms 25 May 2022 509th sean-niemann 🇺🇸 824 50 100ms 23 Dec 2024 509th pardouin 🇫🇷 824 50 79ms 9 Apr 2025 509th stefangimmillaro 824 50 99ms 27 May 2025 517th RYNO8 824 72 19ms 28 Sep 2021 517th FlorianCassayre 🇫🇷 824 72 214ms 18 Sep 2023 517th tobeannouncd 824 72 18ms 25 Apr 2025 517th 4atj 824 72 145ms 21 days ago 517th HPWiz 🇳🇿 824 72 142ms 20 days ago 522nd inventshah 823 60 1,055ms 29 Sep 2023 522nd emgordon154 823 60 821ms 18 Nov 2024 524th albanian-laundromat 823 68 426ms 7 Oct 2025 525th IanUtley 823 92 2,995ms 24 Oct 2023 526th sean-niemann 🇺🇸 823 106 40ms 21 Apr 2023 527th neihousaigaai 822 72 10ms 2 Oct 2021 527th stefangimmillaro 822 72 14ms 29 Sep 2023 527th two-bad 🇬🇧 822 72 13ms 25 Feb 2024 527th KrausRaus 🇺🇸 822 72 13ms 14 Oct 2025 527th Lv0Sys 🇵🇱 822 72 11ms 20 days ago 532nd Shanethegamer 🇺🇸 822 88 2ms 19 Nov 2025 532nd DialFrost 🇸🇬 822 88 2ms 9 days ago 534th inventshah 822 98 538ms 10 Sep 2022 534th MeWhenI 🇻🇦 822 98 12ms 16 Aug 2023 536th h3ra993huskp 🇯🇵 822 113 442ms 25 days ago 537th sean-niemann 🇺🇸 821 28 64ms 22 Jul 2022 537th lynn 821 28 72ms 22 Jul 2022 537th MeWhenI 🇻🇦 821 28 114ms 23 Jul 2022 537th sisyphus-ppcg 🇦🇺 821 28 63ms 24 Jul 2022 537th jared-hughes 821 28 61ms 29 Jul 2022 537th AlephSquirrel 821 28 70ms 30 Dec 2022 537th Steffan153 🇫🇮 821 28 66ms 12 Jan 2023 537th DialFrost 🇸🇬 821 28 65ms 28 Jan 2023 537th CornerMercury 🇬🇧 821 28 62ms 24 Aug 2023 537th ovs-code 🇩🇪 821 28 76ms 2 Feb 2024 537th snoozingnewt 🇨🇦 821 28 63ms 1 Sep 2024 537th pardouin 🇫🇷 821 28 61ms 21 Sep 2024 537th LostSyntax21 🇬🇧 821 28 64ms 8 Jan 2025 537th edsrzf 🇳🇿 821 28 65ms 9 Mar 2025 537th CaedenHarper 🇨🇦 821 28 65ms 14 Jul 2025 537th fuzzylojik-golf 🇺🇸 821 28 60ms 9 Sep 2025 553rd andersk 🇺🇸 821 121 121ms 31 Oct 2022 554th sean-niemann 🇺🇸 818 92 91ms 8 Oct 2024 555th Shanethegamer 🇺🇸 818 168 467ms 27 Mar 2025 556th jared-hughes 817 83 126ms 11 Sep 2023 557th sean-niemann 🇺🇸 817 86 3,273ms 30 Oct 2024 558th Shanethegamer 🇺🇸 815 101 458ms 13 Apr 2023 558th emgordon154 815 101 461ms 26 May 2025 560th Yewzir 🇧🇪 815 107 40ms 14 Jan 2024 First Prev 481–560 of 2,026 Next Last