The Calendar hole will go live in approximately 8 days. Why not try and solve it ahead of time?
Evil Numbers 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 161st ramytarchichy 605 81 1ms 22 Jun 2019 161st bendapootie 605 81 1ms 8 Jul 2020 161st oschmidh 605 81 1ms 18 Nov 2020 161st gussy420 605 81 1ms 24 Oct 2023 165th lukasmoellerch 598 82 1ms 14 Jul 2019 165th TheHammerBro 598 82 1ms 5 May 2021 165th aevykt 598 82 1ms 29 Oct 2023 168th aksyristos 590 83 1ms 23 Jan 2023 168th Pluviolithic 590 83 1ms 20 Oct 2023 168th DevinJFarmer 590 83 1ms 29 Oct 2023 168th f-tucker 590 83 1ms 8 Jan 2024 168th 0xV0RT3X 590 83 1ms 5 Mar 2024 168th SirObby 🇫🇮 590 83 1ms 17 Oct 2025 174th AkashTandon167 583 84 1ms 15 Oct 2019 174th resetcentral 583 84 1ms 21 May 2022 174th michztl01 583 84 1ms 6 Jun 2022 174th Andrey2001 583 84 1ms 26 days ago 178th PatrickLove 576 85 1ms 26 Jun 2019 178th drkameleon 🇪🇸 576 85 2ms 31 Jan 2020 178th jstanley0 576 85 1ms 12 Dec 2020 178th TornadoCookie 576 85 1ms 25 Dec 2022 182nd Bobini1 🇵🇱 570 86 1ms 10 Feb 2022 182nd Haksell 🇦🇶 570 86 1ms 28 Feb 2023 182nd s-gannon 570 86 1ms 3 May 2023 182nd GolfingSuccess 🇬🇷 570 86 2ms 15 Aug 2025 186th qwertzguy 🇫🇷 563 87 1ms 24 Dec 2020 186th esseeffeenne 563 87 2ms 6 Jun 2022 186th jccummi1 563 87 1ms 29 Oct 2023 186th carlsoncorey16 563 87 1ms 29 Oct 2023 186th zgialor-lab 563 87 5ms 6 days ago 191st generot 🇧🇬 557 88 1ms 2 Jul 2020 191st yettinmoor 557 88 1ms 4 Sep 2020 191st chunky 557 88 1ms 2 Oct 2020 191st godraadam 557 88 1ms 17 Nov 2020 191st 2011-Chan-Ethan 557 88 1ms 10 Jul 2021 196th PiterAnnema 551 89 1ms 28 Aug 2020 196th jgbaldwinbrown 551 89 1ms 30 Jun 2021 196th xbxbxb007 551 89 1ms 10 Jan 2024 196th 0dyse 551 89 2ms 23 Apr 2025 200th KiwiKoder0123 538 91 1ms 28 Jun 2019 200th tm70 538 91 1ms 23 Jan 2021 202nd MistMech 533 92 1ms 29 Oct 2023 203rd michatmon 527 93 1ms 11 Jan 2022 203rd aubergine-sauce 527 93 2ms 21 May 2023 205th msbranicky 521 94 2ms 28 Aug 2023 206th AIn0n 516 95 1ms 26 Jun 2021 206th NeatCrown 🇨🇦 516 95 1ms 5 Dec 2022 206th HumanoidCPU 516 95 2ms 18 Mar 2024 209th AlexOgn 510 96 1ms 2 Jul 2020 210th kendstott 505 97 1ms 27 Jun 2019 211th Leftykap 500 98 1ms 20 May 2023 212th dillon-duncando 495 99 2ms 24 Dec 2021 213th DrProfPatPending 490 100 1ms 25 Jun 2019 213th doge1338 490 100 1ms 19 Mar 2021 215th Giantnoodlemonster 485 101 2ms 4 Oct 2024 215th Kowalskiexe 🇵🇱 485 101 2ms 10 Sep 2025 217th ryguyNelson 480 102 1ms 23 Mar 2020 218th Cadichon 🇫🇷 476 103 1ms 2 Mar 2022 219th Adrien-AM 454 108 1ms 3 Dec 2021 219th j-Ewan 454 108 2ms 9 Feb 2023 221st pdewilde 450 109 2ms 18 Oct 2019 222nd agrukuki 445 110 1ms 3 Oct 2020 222nd hjcafaroUC 445 110 1ms 5 Aug 2023 224th kennyhow 441 111 2ms 27 Jan 2021 224th DataResearch 441 111 2ms 2 Jan 2022 226th KatieLG 🇬🇧 438 112 1ms 1 Dec 2020 226th xkacer 🇨🇿 438 112 1ms 5 Feb 2021 226th mokymok 🇺🇸 438 112 1ms 9 Nov 2021 226th JayantaNath 438 112 5ms 16 Apr 2022 226th ibratcher 438 112 1ms 29 Oct 2023 231st KatieLG-Transpiler 🇬🇧 430 114 1ms 23 Jun 2022 231st epic-programmer-guy 430 114 1ms 20 Dec 2023 233rd Jokillerbee 422 116 1ms 3 Jun 2019 233rd lilymonad 422 116 1ms 25 Jul 2019 233rd Schmitt-Very-Cool 422 116 1ms 31 Jul 2023 236th calinous 🇷🇴 419 117 1ms 27 Feb 2023 236th Maximizer02 419 117 1ms 13 Jan 2025 238th shaneliu-zf 🇹🇼 412 119 1ms 6 Jul 2020 239th 201170 408 120 1ms 29 Jul 2022 240th mrmena 🇦🇺 398 123 2ms 6 Mar 2022 First Prev 161–240 of 259 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