The Calendar hole will go live in approximately 12 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 631st prplz 🇦🇺 927 40 1ms 12 Jan 2023 631st Shanethegamer 🇺🇸 927 40 1ms 6 Feb 2023 631st JayXon 🇺🇸 927 40 2ms 16 Mar 2023 631st xsot 🇸🇬 927 40 2ms 14 Jul 2023 631st Yewzir 🇧🇪 927 40 2ms 12 Oct 2023 631st Betuaredead 927 40 1ms 11 Nov 2023 631st pardouin 🇫🇷 927 40 2ms 17 Aug 2024 631st fuzzylojik-golf 🇺🇸 927 40 2ms 1 Jul 2025 631st edsrzf 🇳🇿 927 40 2ms 4 Sep 2025 631st snoozingnewt 🇨🇦 927 40 2ms 20 Oct 2025 631st KasperKivimaeki 🇫🇮 927 40 2ms 3 days ago 652nd inventshah 926 42 2ms 9 Sep 2022 652nd Lydxn 🇨🇦 926 42 2ms 9 Sep 2022 652nd JayXon 🇺🇸 926 42 2ms 10 Sep 2022 652nd btnlq 926 42 2ms 10 Sep 2022 652nd GrayJoKing 🇦🇺 926 42 2ms 11 Sep 2022 652nd m-tkach 🇺🇦 926 42 2ms 25 Oct 2022 652nd sean-niemann 🇺🇸 926 42 2ms 3 Nov 2022 652nd MeWhenI 🇻🇦 926 42 2ms 5 Nov 2022 652nd DialFrost 🇸🇬 926 42 2ms 12 Jan 2023 652nd Steffan153 🇫🇮 926 42 2ms 12 Jan 2023 652nd Shanethegamer 🇺🇸 926 42 2ms 6 Feb 2023 652nd sisyphus-ppcg 🇦🇺 926 42 2ms 23 Mar 2023 652nd prplz 🇦🇺 926 42 2ms 23 May 2023 652nd ovs-code 🇩🇪 926 42 2ms 17 Jul 2023 652nd Yewzir 🇧🇪 926 42 2ms 11 Oct 2023 652nd Betuaredead 926 42 2ms 11 Nov 2023 652nd dokutan 926 42 2ms 27 Mar 2024 652nd pardouin 🇫🇷 926 42 2ms 20 Aug 2024 652nd stefangimmillaro 926 42 2ms 30 Sep 2024 652nd fuzzylojik-golf 🇺🇸 926 42 2ms 18 Jul 2025 652nd edsrzf 🇳🇿 926 42 3ms 22 Jul 2025 652nd snoozingnewt 🇨🇦 926 42 2ms 20 Oct 2025 674th Lydxn 🇨🇦 925 40 3ms 23 May 2023 674th primo-ppcg 🇹🇭 925 40 4ms 23 May 2023 674th GrayJoKing 🇦🇺 925 40 3ms 12 Aug 2023 674th kg583 🇺🇸 925 40 4ms 16 Oct 2025 678th edsrzf 🇳🇿 924 32 658ms 4 Sep 2025 678th DialFrost 🇸🇬 924 32 686ms 4 Sep 2025 678th CaedenHarper 🇨🇦 924 32 633ms 9 Sep 2025 678th sean-niemann 🇺🇸 924 32 612ms 12 Sep 2025 678th fuzzylojik-golf 🇺🇸 924 32 652ms 22 Sep 2025 678th snoozingnewt 🇨🇦 924 32 645ms 20 Oct 2025 678th xsot 🇸🇬 924 32 664ms 13 Nov 2025 678th Yewzir 🇧🇪 924 32 652ms 15 Nov 2025 686th Lydxn 🇨🇦 924 38 73ms 12 Dec 2022 686th ovs-code 🇩🇪 924 38 76ms 22 Apr 2024 686th DialFrost 🇸🇬 924 38 75ms 27 May 2024 686th sean-niemann 🇺🇸 924 38 76ms 12 Jul 2024 686th Steffan153 🇫🇮 924 38 72ms 13 Jul 2024 686th pardouin 🇫🇷 924 38 70ms 19 Aug 2024 692nd Yewzir 🇧🇪 924 41 94ms 22 Dec 2024 692nd dokutan 924 41 96ms 22 Dec 2024 692nd DialFrost 🇸🇬 924 41 96ms 22 Dec 2024 692nd rucin93 🇵🇱 924 41 94ms 22 Dec 2024 692nd JayXon 🇺🇸 924 41 100ms 22 Dec 2024 692nd Shanethegamer 🇺🇸 924 41 90ms 22 Dec 2024 692nd pardouin 🇫🇷 924 41 97ms 22 Dec 2024 692nd MeWhenI 🇻🇦 924 41 96ms 23 Dec 2024 692nd sean-niemann 🇺🇸 924 41 98ms 23 Dec 2024 692nd inventshah 924 41 94ms 23 Dec 2024 692nd ovs-code 🇩🇪 924 41 96ms 24 Dec 2024 692nd primo-ppcg 🇹🇭 924 41 94ms 6 Jan 2025 692nd sisyphus-ppcg 🇦🇺 924 41 93ms 6 Jan 2025 692nd prplz 🇦🇺 924 41 89ms 7 Jan 2025 692nd GrayJoKing 🇦🇺 924 41 96ms 21 Mar 2025 692nd edsrzf 🇳🇿 924 41 108ms 22 Jul 2025 692nd fuzzylojik-golf 🇺🇸 924 41 96ms 29 Aug 2025 692nd snoozingnewt 🇨🇦 924 41 92ms 20 Oct 2025 710th JayXon 🇺🇸 923 82 279ms 9 Feb 2021 710th GrayJoKing 🇦🇺 923 82 276ms 9 Feb 2021 710th primo-ppcg 🇹🇭 923 82 263ms 9 Feb 2021 710th sisyphus-ppcg 🇦🇺 923 82 258ms 10 Feb 2021 710th prplz 🇦🇺 923 82 283ms 10 Feb 2021 710th Lydxn 🇨🇦 923 82 255ms 10 Feb 2021 710th NewDefectus 🇮🇱 923 82 263ms 8 May 2021 710th lynn 923 82 266ms 11 Sep 2021 710th akshatj27 🇦🇶 923 82 264ms 11 Jan 2022 710th inventshah 923 82 263ms 11 Sep 2022 710th sean-niemann 🇺🇸 923 82 264ms 3 Nov 2022 First Prev 641–720 of 3,299 Next Last