The Calendar hole will go live in approximately 4 days. Why not try and solve it ahead of time?
Emirp Numbers (Long) in C# 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 1st JayXon 🇺🇸 1,000 109 489ms 6 Nov 2022 2nd primo-ppcg 🇹🇭 991 110 346ms 10 Apr 2025 3rd nwellnhof 🇩🇪 973 112 344ms 14 Mar 2023 3rd tomtheisen 🇺🇸 973 112 433ms 10 Apr 2025 5th DialFrost 🇸🇬 965 113 383ms 16 Aug 2025 6th namelessiw 940 116 405ms 14 Aug 2025 7th Yax42 🇫🇷 932 117 433ms 15 Aug 2025 8th MeWhenI 🇻🇦 916 119 362ms 19 Jun 2025 9th stefangimmillaro 893 122 373ms 20 Jun 2025 10th janbehrens 🇩🇪 886 123 377ms 17 Apr 2025 11th AdrienHache 🇫🇷 838 130 452ms 15 Aug 2025 12th sean-niemann 🇺🇸 832 131 487ms 25 Sep 2025 13th Steffan153 🇫🇮 826 132 485ms 8 Nov 2022 14th Yewzir 🇧🇪 790 138 356ms 11 Feb 2024 15th kmathis22 722 151 388ms 26 Sep 2025 16th Shanethegamer 🇺🇸 717 152 478ms 20 Apr 2023 17th michelebastione 🇮🇹 708 154 533ms 103 mins ago 18th SmartK8 🇨🇿 699 156 667ms 31 Oct 2022 18th annaproxy 699 156 492ms 24 Oct 2023 20th dokutan 694 157 341ms 18 Nov 2025 21st tomh1012 690 158 377ms 8 Nov 2022 21st bac0id 690 158 371ms 29 Jun 2024 23rd CatsAreFluffy 686 159 425ms 28 Nov 2022 24th arctouch-cristiannevianna 681 160 438ms 25 May 2023 25th ChrisTheisen 623 175 378ms 19 Dec 2022 25th msbranicky 623 175 442ms 27 Aug 2023 27th rifatx 616 177 505ms 10 Jul 2024 28th snoozingnewt 🇨🇦 602 181 407ms 9 Oct 2025 29th najs91 596 183 465ms 31 Oct 2024 30th CaedenHarper 🇨🇦 592 184 557ms 19 Oct 2025 31st postie77 583 187 372ms 30 May 2023 32nd KatieLG 🇬🇧 580 188 443ms 13 Oct 2024 33rd ElysiaVesper 540 202 358ms 19 Nov 2023 34th hamhub7 509 214 433ms 30 Dec 2022 34th Adix-null 🇱🇹 509 214 366ms 29 Jul 2023 36th Mikey-Beep 🇬🇧 482 226 471ms 3 Sep 2024 37th kevinnaviapaiva 359 304 343ms 22 Feb 2025 38th eldritchconundrum 124 882 383ms 31 Oct 2022 39th aliakseikalosha 111 979 488ms 31 Oct 2022 40th HumanoidCPU 93 1,174 373ms 24 Aug 2024 41st retrohun 77 1,412 360ms 27 Dec 2022 41st Mabeloid 🇳🇴 77 1,412 343ms 17 Sep 2024 43rd KatieLG-Transpiler 🇬🇧 77 1,416 337ms 29 Oct 2022 1–43 of 43
