The Calendar hole will go live in approximately 13 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 401st Shanethegamer 🇺🇸 856 98 5ms 20 Dec 2024 402nd saito-ta 🇯🇵 852 27 570ms 12 Aug 2022 402nd GolfingSuccess 🇬🇷 852 27 457ms 16 Aug 2022 402nd clockworknazo 852 27 570ms 6 Sep 2022 402nd orthoplex 🇨🇽 852 27 791ms 1 Feb 2024 406th DialFrost 🇸🇬 852 89 378ms 16 Nov 2025 407th DialFrost 🇸🇬 851 58 1,134ms 13 Apr 2025 408th ovs-code 🇩🇪 851 89 12ms 30 Jun 2024 409th CLOStrophobic 🇮🇹 851 116 506ms 10 Feb 2025 410th emplv 🇱🇻 850 148 24ms 29 Jun 2022 411th MeWhenI 🇻🇦 849 72 85ms 13 Dec 2022 412th MeWhenI 🇻🇦 849 77 64ms 19 Sep 2021 412th snoozingnewt 🇨🇦 849 77 65ms 16 Oct 2025 414th The3gs 849 117 129ms 29 Nov 2024 415th Shanethegamer 🇺🇸 848 66 584ms 16 Jan 2024 415th snoozingnewt 🇨🇦 848 66 581ms 28 Sep 2025 415th Babafaba 848 66 637ms 3 Nov 2025 418th CaedenHarper 🇨🇦 848 71 824ms 11 Sep 2025 419th marcin7Cd 848 80 146ms 29 Sep 2021 419th cbrt-x 848 80 154ms 15 Sep 2023 421st Steffan153 🇫🇮 848 81 3ms 12 Jan 2023 422nd Lydxn 🇨🇦 848 90 40ms 20 Sep 2021 422nd Steffan153 🇫🇮 848 90 40ms 12 Jan 2023 422nd stefangimmillaro 848 90 40ms 26 Jan 2023 422nd MeWhenI 🇻🇦 848 90 41ms 14 May 2023 422nd DialFrost 🇸🇬 848 90 41ms 22 Oct 2024 427th lynn 848 115 28ms 21 Aug 2023 428th edsrzf 🇳🇿 848 139 268ms 23 Oct 2024 429th MeWhenI 🇻🇦 847 50 20ms 15 Feb 2025 430th MeWhenI 🇻🇦 847 70 19ms 22 Oct 2021 430th 2011-Chan-Ethan 847 70 328ms 12 Jul 2023 430th jatloe 847 70 331ms 27 Sep 2024 430th Flekay 🇩🇪 847 70 224ms 10 Jul 2025 430th JOrE20 🇺🇸 847 70 21ms 14 days ago 435th inventshah 847 83 3,973ms 24 Oct 2024 435th aditsu 847 83 4,335ms 10 Aug 2025 437th duckyluuk 🇳🇱 847 88 28ms 12 Dec 2024 437th GolfingSuccess 🇬🇷 847 88 22ms 11 Sep 2025 439th snoozingnewt 🇨🇦 847 99 4ms 1 Sep 2024 440th Lydxn 🇨🇦 846 89 142ms 4 Sep 2023 441st ovs-code 🇩🇪 845 190 18ms 9 Jul 2024 442nd emplv 🇱🇻 844 63 133ms 17 Jul 2025 443rd Shanethegamer 🇺🇸 844 110 447ms 25 Sep 2025 443rd Yewzir 🇧🇪 844 110 446ms 2 Oct 2025 443rd CaedenHarper 🇨🇦 844 110 480ms 5 Nov 2025 443rd MeWhenI 🇻🇦 844 110 427ms 7 Nov 2025 447th Irratix 🇳🇱 843 112 61ms 3 Jan 2022 448th MeWhenI 🇻🇦 843 163 565ms 28 Mar 2025 449th Yewzir 🇧🇪 842 118 127ms 5 Feb 2024 450th janbehrens 🇩🇪 842 140 268ms 20 Sep 2021 451st ovs-code 🇩🇪 842 180 1,738ms 14 Sep 2025 451st Yewzir 🇧🇪 842 180 2,518ms 14 Nov 2025 453rd rucin93 🇵🇱 840 86 2ms 19 Nov 2025 454th DialFrost 🇸🇬 840 98 379ms 16 Nov 2025 455th emplv 🇱🇻 838 78 47ms 19 Apr 2024 456th primo-ppcg 🇹🇭 838 82 1ms 22 Sep 2021 456th nwellnhof 🇩🇪 838 82 2ms 22 Sep 2021 456th Attero 🇸🇪 838 82 3ms 23 Dec 2021 456th c0d3-4-F00d 🇩🇪 838 82 3ms 5 Jan 2022 456th snoozingnewt 🇨🇦 838 82 3ms 13 Sep 2025 461st Waffle3z 837 91 2ms 19 Sep 2021 461st primo-ppcg 🇹🇭 837 91 2ms 23 Sep 2021 461st JayXon 🇺🇸 837 91 2ms 3 Oct 2021 461st Lydxn 🇨🇦 837 91 2ms 9 Apr 2022 461st btnlq 837 91 2ms 27 Dec 2022 461st FlyingPenguin223 837 91 2ms 29 Oct 2024 467th jared-hughes 837 181 1,666ms 16 Sep 2025 467th MeWhenI 🇻🇦 837 181 1,677ms 7 Nov 2025 469th dokutan 836 67 590ms 4 Feb 2025 470th Shanethegamer 🇺🇸 836 95 106ms 14 Oct 2022 470th emplv 🇱🇻 836 95 101ms 28 Oct 2022 470th Yewzir 🇧🇪 836 95 100ms 28 Mar 2024 473rd stefangimmillaro 836 111 528ms 6 Oct 2025 473rd kmathis22 836 111 403ms 20 Nov 2025 473rd ethanlally 836 111 366ms 25 days ago 473rd dokutan 836 111 411ms 24 days ago 473rd snoozingnewt 🇨🇦 836 111 387ms 12 days ago 478th MeWhenI 🇻🇦 836 113 84ms 29 Nov 2022 479th lynn 835 119 148ms 10 Mar 2022 479th ovs-code 🇩🇪 835 119 130ms 23 Jun 2023 First Prev 401–480 of 2,025 Next Last