The Calendar hole will go live in approximately 7 days. Why not try and solve it ahead of time?
Pernicious Numbers (Long) in all languages 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 240th JayXon 🇺🇸 925 54 17ms 26 Oct 2023 240th Lydxn 🇨🇦 925 54 17ms 26 Oct 2023 240th IanUtley 925 54 17ms 14 Nov 2023 240th ovs-code 🇩🇪 925 54 17ms 1 Jul 2024 245th Steffan153 🇫🇮 924 45 425ms 20 Nov 2022 245th ovs-code 🇩🇪 924 45 418ms 24 Oct 2023 245th sean-niemann 🇺🇸 924 45 412ms 24 Oct 2023 245th DialFrost 🇸🇬 924 45 445ms 21 Dec 2023 249th JayXon 🇺🇸 924 50 6ms 19 Nov 2025 249th pardouin 🇫🇷 924 50 6ms 19 Nov 2025 251st stefangimmillaro 924 57 87ms 20 Nov 2022 251st Lydxn 🇨🇦 924 57 87ms 20 Nov 2022 251st JayXon 🇺🇸 924 57 88ms 21 Nov 2022 251st Steffan153 🇫🇮 924 57 89ms 30 Jan 2023 251st sean-niemann 🇺🇸 924 57 92ms 7 Feb 2023 251st DialFrost 🇸🇬 924 57 89ms 21 Dec 2023 257th AlephSquirrel 924 58 46ms 15 Jan 2023 257th edsrzf 🇳🇿 924 58 46ms 10 hours ago 259th Lydxn 🇨🇦 924 59 23ms 22 Dec 2023 259th edsrzf 🇳🇿 924 59 25ms 9 hours ago 261st Bubbler-4 923 26 3ms 23 Nov 2022 261st Natanaelel 🇸🇪 923 26 3ms 14 Jul 2023 261st SirBogman 🇺🇸 923 26 3ms 9 Nov 2023 261st DialFrost 🇸🇬 923 26 2ms 3 Feb 2024 261st bstrat 923 26 2ms 9 Jun 2024 261st zacjl 923 26 3ms 17 Aug 2024 261st shadowninja55 🇺🇸 923 26 2ms 30 Dec 2024 261st Garklein 🇨🇦 923 26 2ms 6 Jan 2025 261st GrayJoKing 🇦🇺 923 26 2ms 5 Jun 2025 270th Bubbler-4 923 45 70ms 13 Sep 2023 270th Lydxn 🇨🇦 923 45 72ms 13 Sep 2023 270th chunes3 🇺🇸 923 45 70ms 13 Sep 2023 270th 4hg 🇺🇸 923 45 70ms 15 Sep 2023 270th Steffan153 🇫🇮 923 45 69ms 15 Sep 2023 270th gifti258 923 45 69ms 15 Sep 2023 270th MeWhenI 🇻🇦 923 45 67ms 2 Nov 2023 270th Yewzir 🇧🇪 923 45 70ms 5 Mar 2024 278th Lydxn 🇨🇦 923 52 1,623ms 20 Jul 2023 279th Lydxn 🇨🇦 923 53 1,084ms 21 Jul 2023 279th ovs-code 🇩🇪 923 53 137ms 16 Aug 2023 281st henkma 922 67 323ms 6 Jun 2023 281st xnor-gate 922 67 373ms 17 Jun 2023 283rd primo-ppcg 🇹🇭 921 54 41ms 20 Nov 2022 283rd Lydxn 🇨🇦 921 54 42ms 20 Nov 2022 285th Shanethegamer 🇺🇸 920 55 36ms 21 Nov 2022 285th luuumine 🇫🇷 920 55 23ms 17 days ago 287th DialFrost 🇸🇬 920 56 3,375ms 23 Oct 2024 287th pardouin 🇫🇷 920 56 3,912ms 23 Oct 2024 287th inventshah 920 56 4,186ms 24 Oct 2024 287th sean-niemann 🇺🇸 920 56 3,928ms 24 Oct 2024 287th stefangimmillaro 920 56 4,187ms 24 Oct 2024 287th btnlq 920 56 3,908ms 26 Oct 2024 287th JayXon 🇺🇸 920 56 3,503ms 7 Nov 2024 294th JayXon 🇺🇸 920 62 131ms 27 Nov 2022 294th pardouin 🇫🇷 920 62 148ms 22 Apr 2025 296th emgordon154 919 28 313ms 19 Mar 2025 297th JayXon 🇺🇸 919 61 101ms 27 Nov 2022 297th Lydxn 🇨🇦 919 61 101ms 20 Jul 2023 297th pardouin 🇫🇷 919 61 108ms 22 Apr 2025 300th snoozingnewt 🇨🇦 918 76 360ms 18 days ago 301st JayXon 🇺🇸 917 57 94ms 27 Nov 2022 301st Lydxn 🇨🇦 917 57 98ms 20 Jul 2023 303rd btnlq 917 70 342ms 28 Dec 2022 303rd tomtheisen 🇺🇸 917 70 333ms 7 Feb 2023 305th Steffan153 🇫🇮 916 58 21ms 3 Feb 2023 305th Lydxn 🇨🇦 916 58 21ms 3 Feb 2023 307th primo-ppcg 🇹🇭 916 64 8ms 19 Jun 2023 307th Lydxn 🇨🇦 916 64 8ms 21 Jul 2023 309th primo-ppcg 🇹🇭 916 80 59ms 20 Nov 2022 309th pardouin 🇫🇷 916 80 59ms 31 May 2025 311th Andriamanitra 🇫🇮 915 45 46ms 17 Jul 2023 312th Lydxn 🇨🇦 914 60 3ms 20 Jul 2023 313th GrayJoKing 🇦🇺 913 59 5ms 26 Oct 2023 313th JohandeRuiter 🇳🇱 913 59 4ms 1 Nov 2023 315th primo-ppcg 🇹🇭 912 56 6ms 20 Nov 2022 316th DialFrost 🇸🇬 912 59 37ms 4 Apr 2025 317th Lydxn 🇨🇦 912 76 446ms 20 Nov 2022 317th JayXon 🇺🇸 912 76 426ms 7 Feb 2023 319th pardouin 🇫🇷 911 50 132ms 21 Apr 2025 320th commandblockguy 🇺🇸 911 52 321ms 15 Jan 2024 First Prev 241–320 of 1,819 Next Last