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 79th rifatx 609 87 359ms 19 Jul 2024 79th alicethecatwhisperermeow 609 87 404ms 6 Aug 2024 79th Natanaelel 🇸🇪 609 87 374ms 10 Apr 2025 79th snoozingnewt 🇨🇦 609 87 346ms 28 Sep 2025 85th pikti 602 88 312ms 21 Nov 2021 85th p-vf 🇨🇭 602 88 350ms 16 Jul 2022 85th astdefu 602 88 353ms 13 Dec 2022 85th ertz1ertz 602 88 369ms 9 Aug 2024 89th zer0bits42 596 89 320ms 14 Nov 2022 89th mwarvik 596 89 344ms 6 hours ago 91st jmhowl 589 90 328ms 21 Nov 2021 91st TheKPAXian 589 90 319ms 21 Nov 2021 91st RandGuy 589 90 339ms 8 Dec 2021 91st Soyo-Wind 589 90 367ms 9 Nov 2025 95th msbranicky 582 91 321ms 22 Aug 2023 96th petroselo 576 92 360ms 21 Nov 2021 97th yannikHoeflich 570 93 317ms 21 Nov 2021 97th rollershutter 570 93 309ms 7 Apr 2022 97th aDwarfNamedUrist 570 93 366ms 11 Sep 2024 100th muztanger 564 94 322ms 21 Nov 2021 100th MaxElf999 564 94 316ms 3 Oct 2022 100th Pyro569 564 94 307ms 20 Jul 2023 103rd eshilo-draper 546 97 321ms 3 Sep 2022 103rd Alex-Huggett 🇬🇧 546 97 315ms 14 Apr 2024 103rd Ythaenagor 546 97 369ms 5 Aug 2024 106th SpareManiKatti 541 98 334ms 21 Nov 2021 106th wescombs10 541 98 321ms 29 Oct 2022 108th Mikey-Beep 🇬🇧 535 99 396ms 2 Sep 2024 108th hippopotam00sehead 🇨🇦 535 99 387ms 11 Sep 2024 110th MadScience137 530 100 325ms 12 Oct 2022 111th adotagarwal 525 101 356ms 4 Mar 2023 112th iamdavidfrancis 510 104 339ms 21 Nov 2021 112th TimJackMaster 510 104 344ms 16 Feb 2023 112th nakatchi 510 104 323ms 17 Mar 2024 115th taylorbrown2686 505 105 314ms 8 Mar 2022 116th mduckles 500 106 322ms 19 Nov 2022 116th johannes-looney-lizard 500 106 358ms 29 Apr 2025 118th Dexaan 495 107 322ms 21 Nov 2021 119th Jennifervl 🇸🇪 482 110 317ms 11 Dec 2021 120th resoNathan 477 111 317ms 25 Apr 2024 121st mokymok 🇺🇸 473 112 318ms 21 Nov 2021 121st retrohun 473 112 307ms 28 Dec 2022 121st Mabeloid 🇳🇴 473 112 352ms 4 Oct 2024 124th Cbrt74088 457 116 327ms 21 Nov 2021 124th tbschff 457 116 327ms 16 Apr 2022 124th KatieLG-Transpiler 🇬🇧 457 116 360ms 23 Jun 2022 124th zt14427 457 116 314ms 30 Aug 2023 124th acotis 457 116 322ms 19 Feb 2025 129th aplato 449 118 370ms 21 Nov 2021 130th BradSissons 🇳🇿 438 121 328ms 21 Nov 2021 131st Mortistar 431 123 316ms 18 Jul 2023 132nd hklemp 🇩🇪 427 124 326ms 21 Nov 2021 133rd ze-h 🇺🇸 421 126 330ms 24 Aug 2022 133rd charliegaming 421 126 344ms 3 Oct 2023 135th BeansMage42 408 130 365ms 29 Dec 2024 136th MarkStockwellZA 402 132 357ms 4 Jan 2022 137th artisiole 🇺🇸 371 143 331ms 3 Mar 2022 138th codewrite 🇬🇧 349 152 402ms 29 May 2025 139th kevinnaviapaiva 342 155 332ms 25 Feb 2025 140th ryguyNelson 321 165 323ms 21 Nov 2021 141st willpiam 315 168 348ms 20 Oct 2023 142nd bilal2709 285 186 340ms 8 Sep 2025 143rd BharadwajSridharan 🇮🇳 114 465 349ms 21 Nov 2021 First Prev 81–143 of 143
