The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
Pernicious Numbers 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 629th JayXon 🇺🇸 927 40 2ms 16 Mar 2023 629th xsot 🇸🇬 927 40 2ms 14 Jul 2023 629th Yewzir 🇧🇪 927 40 2ms 12 Oct 2023 629th Betuaredead 927 40 1ms 11 Nov 2023 629th pardouin 🇫🇷 927 40 2ms 17 Aug 2024 629th fuzzylojik-golf 🇺🇸 927 40 2ms 1 Jul 2025 629th edsrzf 🇳🇿 927 40 2ms 4 Sep 2025 629th snoozingnewt 🇨🇦 927 40 2ms 20 Oct 2025 629th KasperKivimaeki 🇫🇮 927 40 2ms 3 days ago 650th inventshah 926 42 2ms 9 Sep 2022 650th Lydxn 🇨🇦 926 42 2ms 9 Sep 2022 650th JayXon 🇺🇸 926 42 2ms 10 Sep 2022 650th btnlq 926 42 2ms 10 Sep 2022 650th GrayJoKing 🇦🇺 926 42 2ms 11 Sep 2022 650th m-tkach 🇺🇦 926 42 2ms 25 Oct 2022 650th sean-niemann 🇺🇸 926 42 2ms 3 Nov 2022 650th MeWhenI 🇻🇦 926 42 2ms 5 Nov 2022 650th DialFrost 🇸🇬 926 42 2ms 12 Jan 2023 650th Steffan153 🇫🇮 926 42 2ms 12 Jan 2023 650th Shanethegamer 🇺🇸 926 42 2ms 6 Feb 2023 650th sisyphus-ppcg 🇦🇺 926 42 2ms 23 Mar 2023 650th prplz 🇦🇺 926 42 2ms 23 May 2023 650th ovs-code 🇩🇪 926 42 2ms 17 Jul 2023 650th Yewzir 🇧🇪 926 42 2ms 11 Oct 2023 650th Betuaredead 926 42 2ms 11 Nov 2023 650th dokutan 926 42 2ms 27 Mar 2024 650th pardouin 🇫🇷 926 42 2ms 20 Aug 2024 650th stefangimmillaro 926 42 2ms 30 Sep 2024 650th fuzzylojik-golf 🇺🇸 926 42 2ms 18 Jul 2025 650th edsrzf 🇳🇿 926 42 3ms 22 Jul 2025 650th snoozingnewt 🇨🇦 926 42 2ms 20 Oct 2025 672nd Lydxn 🇨🇦 925 40 3ms 23 May 2023 672nd primo-ppcg 🇹🇭 925 40 4ms 23 May 2023 672nd GrayJoKing 🇦🇺 925 40 3ms 12 Aug 2023 672nd kg583 🇺🇸 925 40 4ms 16 Oct 2025 676th edsrzf 🇳🇿 924 32 658ms 4 Sep 2025 676th DialFrost 🇸🇬 924 32 686ms 4 Sep 2025 676th CaedenHarper 🇨🇦 924 32 633ms 9 Sep 2025 676th sean-niemann 🇺🇸 924 32 612ms 12 Sep 2025 676th fuzzylojik-golf 🇺🇸 924 32 652ms 22 Sep 2025 676th snoozingnewt 🇨🇦 924 32 645ms 20 Oct 2025 676th xsot 🇸🇬 924 32 664ms 13 Nov 2025 676th Yewzir 🇧🇪 924 32 652ms 15 Nov 2025 684th Lydxn 🇨🇦 924 38 73ms 12 Dec 2022 684th ovs-code 🇩🇪 924 38 76ms 22 Apr 2024 684th DialFrost 🇸🇬 924 38 75ms 27 May 2024 684th sean-niemann 🇺🇸 924 38 76ms 12 Jul 2024 684th Steffan153 🇫🇮 924 38 72ms 13 Jul 2024 684th pardouin 🇫🇷 924 38 70ms 19 Aug 2024 690th Yewzir 🇧🇪 924 41 94ms 22 Dec 2024 690th dokutan 924 41 96ms 22 Dec 2024 690th DialFrost 🇸🇬 924 41 96ms 22 Dec 2024 690th rucin93 🇵🇱 924 41 94ms 22 Dec 2024 690th JayXon 🇺🇸 924 41 100ms 22 Dec 2024 690th Shanethegamer 🇺🇸 924 41 90ms 22 Dec 2024 690th pardouin 🇫🇷 924 41 97ms 22 Dec 2024 690th MeWhenI 🇻🇦 924 41 96ms 23 Dec 2024 690th sean-niemann 🇺🇸 924 41 98ms 23 Dec 2024 690th inventshah 924 41 94ms 23 Dec 2024 690th ovs-code 🇩🇪 924 41 96ms 24 Dec 2024 690th primo-ppcg 🇹🇭 924 41 94ms 6 Jan 2025 690th sisyphus-ppcg 🇦🇺 924 41 93ms 6 Jan 2025 690th prplz 🇦🇺 924 41 89ms 7 Jan 2025 690th GrayJoKing 🇦🇺 924 41 96ms 21 Mar 2025 690th edsrzf 🇳🇿 924 41 108ms 22 Jul 2025 690th fuzzylojik-golf 🇺🇸 924 41 96ms 29 Aug 2025 690th snoozingnewt 🇨🇦 924 41 92ms 20 Oct 2025 708th JayXon 🇺🇸 923 82 279ms 9 Feb 2021 708th GrayJoKing 🇦🇺 923 82 276ms 9 Feb 2021 708th primo-ppcg 🇹🇭 923 82 263ms 9 Feb 2021 708th sisyphus-ppcg 🇦🇺 923 82 258ms 10 Feb 2021 708th prplz 🇦🇺 923 82 283ms 10 Feb 2021 708th Lydxn 🇨🇦 923 82 255ms 10 Feb 2021 708th NewDefectus 🇮🇱 923 82 263ms 8 May 2021 708th lynn 923 82 266ms 11 Sep 2021 708th akshatj27 🇦🇶 923 82 264ms 11 Jan 2022 708th inventshah 923 82 263ms 11 Sep 2022 708th sean-niemann 🇺🇸 923 82 264ms 3 Nov 2022 708th stefangimmillaro 923 82 280ms 4 Nov 2022 708th MeWhenI 🇻🇦 923 82 262ms 5 Nov 2022 First Prev 641–720 of 3,296 Next Last