The Calendar hole will go live in approximately 7 days. Why not try and solve it ahead of time?
Prime Numbers in C++ 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 1st Lydxn 🇨🇦 1,000 70 56ms 2 Jan 2022 1st JayXon 🇺🇸 1,000 70 56ms 7 Mar 2022 3rd solmyr2000 946 74 54ms 21 Jun 2022 3rd 09cf 946 74 4,994ms 22 Nov 2023 3rd dokutan 946 74 52ms 7 Apr 2024 3rd tailorspy 946 74 52ms 25 Sep 2024 7th primo-ppcg 🇹🇭 921 76 56ms 18 Jan 2022 7th inventshah 921 76 55ms 22 Nov 2022 7th KasperKivimaeki 🇫🇮 921 76 396ms 19 Nov 2025 10th prplz 🇦🇺 909 77 57ms 2 Jan 2022 10th nwellnhof 🇩🇪 909 77 58ms 3 Jan 2022 10th michael-pruglo 🇺🇦 909 77 63ms 13 Jul 2022 10th xsot 🇸🇬 909 77 422ms 30 Jan 2024 10th snyderek 🇺🇸 909 77 56ms 13 Oct 2024 10th Herbert00709 🇵🇱 909 77 57ms 16 Oct 2024 10th wojtekmal 909 77 71ms 6 Sep 2025 17th Irratix 🇳🇱 897 78 56ms 3 Aug 2023 17th m-tkach 🇺🇦 897 78 378ms 12 Oct 2023 17th roupiq 🇵🇱 897 78 61ms 14 Apr 2024 17th ovs-code 🇩🇪 897 78 62ms 4 May 2024 17th sean-niemann 🇺🇸 897 78 58ms 17 Jan 2025 22nd iakolzin 886 79 58ms 2 Jun 2022 22nd Steffan153 🇫🇮 886 79 59ms 30 Oct 2022 22nd DialFrost 🇸🇬 886 79 58ms 3 Nov 2023 22nd Mandrzejy 🇵🇱 886 79 4,998ms 16 Oct 2024 26th CatsAreFluffy 875 80 56ms 18 Feb 2023 26th AdrienHache 🇫🇷 875 80 62ms 6 Jan 2024 26th SadiinsoSnowfall 🇫🇷 875 80 60ms 5 Mar 2024 26th oceko 875 80 64ms 5 Mar 2024 26th qwertyuiop3 🇷🇺 875 80 68ms 15 May 2025 26th fuzzylojik-golf 🇺🇸 875 80 61ms 14 Aug 2025 32nd janbehrens 🇩🇪 864 81 55ms 8 Jan 2022 32nd jared-hughes 864 81 57ms 24 Oct 2022 32nd Yewzir 🇧🇪 864 81 68ms 20 May 2023 32nd Betuaredead 864 81 58ms 14 Nov 2023 32nd zygoloid 864 81 62ms 4 Aug 2024 32nd lailai0916 864 81 410ms 17 Aug 2024 32nd pardouin 🇫🇷 864 81 53ms 24 Aug 2024 39th MeWhenI 🇻🇦 854 82 59ms 8 May 2022 39th Alex-x90 🇺🇸 854 82 58ms 20 Sep 2022 39th annaproxy 854 82 65ms 7 Jan 2023 39th Shanethegamer 🇺🇸 854 82 62ms 29 Mar 2023 39th byronknoll 🇺🇸 854 82 53ms 1 Feb 2024 44th jxy2012 843 83 398ms 27 Aug 2024 45th ndren 833 84 63ms 2 Aug 2023 45th CornerMercury 🇬🇧 833 84 53ms 2 Aug 2023 47th H3Rol4x 795 88 59ms 23 Dec 2022 47th timhaj 🇸🇮 795 88 58ms 17 Sep 2025 49th MateuszPietrzak 🇵🇱 787 89 60ms 28 Jan 2024 50th Ripick 761 92 63ms 23 Jul 2022 50th retrohun 761 92 58ms 28 Dec 2022 50th luuumine 🇫🇷 761 92 56ms 13 days ago 53rd Seek64 🇩🇪 753 93 70ms 15 Nov 2022 53rd bac0id 753 93 55ms 23 Feb 2024 55th Re-Adventures 🇮🇳 737 95 63ms 2 Jan 2022 55th veehz 737 95 68ms 21 Feb 2023 55th snoozingnewt 🇨🇦 737 95 416ms 6 Oct 2025 58th gjoacorp 🇬🇧 729 96 58ms 3 Aug 2025 59th cmayer777 722 97 54ms 7 Nov 2022 59th astdefu 722 97 57ms 13 Dec 2022 59th HumanoidCPU 722 97 58ms 3 Feb 2024 62nd f-tucker 714 98 58ms 8 Jan 2024 63rd MaxElf999 707 99 60ms 12 Dec 2022 63rd namcartoon06 707 99 61ms 15 Jul 2023 65th ei14 700 100 58ms 18 Jun 2022 66th Domicnt 693 101 60ms 16 Feb 2023 67th Walter225 686 102 64ms 10 Jul 2023 68th JGDoerrer 680 103 398ms 5 Jan 2022 69th tomh1012 673 104 1,014ms 31 Mar 2022 70th jorbDehmel 🇺🇸 667 105 59ms 17 Jun 2023 70th BpbjsGreen 🇨🇳 667 105 64ms 7 Jul 2024 72nd CaedenHarper 🇨🇦 660 106 54ms 23 Jan 2025 72nd balloffur 660 106 520ms 26 hours ago 74th SnivyLlama 654 107 400ms 28 May 2022 74th osmith93 654 107 60ms 14 Jun 2022 76th msbranicky 648 108 60ms 22 Aug 2023 76th nents 648 108 417ms 24 Jan 2025 76th matejmatik123 🇸🇰 648 108 928ms 26 Sep 2025 79th inverseLorentz 🇦🇺 625 112 58ms 12 Oct 2023 80th 0dyse 619 113 62ms 29 Apr 2025 1–80 of 125 Next Last