The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
Evil 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 160th bendapootie 605 81 1ms 8 Jul 2020 160th oschmidh 605 81 1ms 18 Nov 2020 160th gussy420 605 81 1ms 24 Oct 2023 164th lukasmoellerch 598 82 1ms 14 Jul 2019 164th TheHammerBro 598 82 1ms 5 May 2021 164th aevykt 598 82 1ms 29 Oct 2023 167th aksyristos 590 83 1ms 23 Jan 2023 167th Pluviolithic 590 83 1ms 20 Oct 2023 167th DevinJFarmer 590 83 1ms 29 Oct 2023 167th f-tucker 590 83 1ms 8 Jan 2024 167th 0xV0RT3X 590 83 1ms 5 Mar 2024 167th SirObby 🇫🇮 590 83 1ms 17 Oct 2025 173rd AkashTandon167 583 84 1ms 15 Oct 2019 173rd resetcentral 583 84 1ms 21 May 2022 173rd michztl01 583 84 1ms 6 Jun 2022 173rd Andrey2001 583 84 1ms 21 days ago 177th PatrickLove 576 85 1ms 26 Jun 2019 177th drkameleon 🇪🇸 576 85 2ms 31 Jan 2020 177th jstanley0 576 85 1ms 12 Dec 2020 177th TornadoCookie 576 85 1ms 25 Dec 2022 181st Bobini1 🇵🇱 570 86 1ms 10 Feb 2022 181st Haksell 🇦🇶 570 86 1ms 28 Feb 2023 181st s-gannon 570 86 1ms 3 May 2023 181st GolfingSuccess 🇬🇷 570 86 2ms 15 Aug 2025 185th qwertzguy 🇫🇷 563 87 1ms 24 Dec 2020 185th esseeffeenne 563 87 2ms 6 Jun 2022 185th jccummi1 563 87 1ms 29 Oct 2023 185th carlsoncorey16 563 87 1ms 29 Oct 2023 185th zgialor-lab 563 87 5ms 45 hours ago 190th generot 🇧🇬 557 88 1ms 2 Jul 2020 190th yettinmoor 557 88 1ms 4 Sep 2020 190th chunky 557 88 1ms 2 Oct 2020 190th godraadam 557 88 1ms 17 Nov 2020 190th 2011-Chan-Ethan 557 88 1ms 10 Jul 2021 195th PiterAnnema 551 89 1ms 28 Aug 2020 195th jgbaldwinbrown 551 89 1ms 30 Jun 2021 195th xbxbxb007 551 89 1ms 10 Jan 2024 195th 0dyse 551 89 2ms 23 Apr 2025 199th KiwiKoder0123 538 91 1ms 28 Jun 2019 199th tm70 538 91 1ms 23 Jan 2021 201st MistMech 533 92 1ms 29 Oct 2023 202nd michatmon 527 93 1ms 11 Jan 2022 202nd aubergine-sauce 527 93 2ms 21 May 2023 204th msbranicky 521 94 2ms 28 Aug 2023 205th AIn0n 516 95 1ms 26 Jun 2021 205th NeatCrown 🇨🇦 516 95 1ms 5 Dec 2022 205th HumanoidCPU 516 95 2ms 18 Mar 2024 208th AlexOgn 510 96 1ms 2 Jul 2020 209th kendstott 505 97 1ms 27 Jun 2019 210th Leftykap 500 98 1ms 20 May 2023 211th dillon-duncando 495 99 2ms 24 Dec 2021 212th DrProfPatPending 490 100 1ms 25 Jun 2019 212th doge1338 490 100 1ms 19 Mar 2021 214th Giantnoodlemonster 485 101 2ms 4 Oct 2024 214th Kowalskiexe 🇵🇱 485 101 2ms 10 Sep 2025 216th ryguyNelson 480 102 1ms 23 Mar 2020 217th Cadichon 🇫🇷 476 103 1ms 2 Mar 2022 218th Adrien-AM 454 108 1ms 3 Dec 2021 218th j-Ewan 454 108 2ms 9 Feb 2023 220th pdewilde 450 109 2ms 18 Oct 2019 221st agrukuki 445 110 1ms 3 Oct 2020 221st hjcafaroUC 445 110 1ms 5 Aug 2023 223rd kennyhow 441 111 2ms 27 Jan 2021 223rd DataResearch 441 111 2ms 2 Jan 2022 225th KatieLG 🇬🇧 438 112 1ms 1 Dec 2020 225th xkacer 🇨🇿 438 112 1ms 5 Feb 2021 225th mokymok 🇺🇸 438 112 1ms 9 Nov 2021 225th JayantaNath 438 112 5ms 16 Apr 2022 225th ibratcher 438 112 1ms 29 Oct 2023 230th KatieLG-Transpiler 🇬🇧 430 114 1ms 23 Jun 2022 230th epic-programmer-guy 430 114 1ms 20 Dec 2023 232nd Jokillerbee 422 116 1ms 3 Jun 2019 232nd lilymonad 422 116 1ms 25 Jul 2019 232nd Schmitt-Very-Cool 422 116 1ms 31 Jul 2023 235th calinous 🇷🇴 419 117 1ms 27 Feb 2023 235th Maximizer02 419 117 1ms 13 Jan 2025 237th shaneliu-zf 🇹🇼 412 119 1ms 6 Jul 2020 238th 201170 408 120 1ms 29 Jul 2022 239th mrmena 🇦🇺 398 123 2ms 6 Mar 2022 240th oriphi 395 124 1ms 16 Jun 2019 First Prev 161–240 of 258 Next 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