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 795th Steffan153 🇫🇮 920 46 12ms 24 Nov 2022 795th annaproxy 920 46 12ms 8 Jan 2023 795th Yewzir 🇧🇪 920 46 13ms 23 Feb 2024 795th ovs-code 🇩🇪 920 46 13ms 1 Jul 2024 795th DialFrost 🇸🇬 920 46 13ms 24 Mar 2025 795th sean-niemann 🇺🇸 920 46 13ms 25 Mar 2025 795th snoozingnewt 🇨🇦 920 46 13ms 11 days ago 808th GrayJoKing 🇦🇺 919 48 76ms 6 Jun 2022 808th Lydxn 🇨🇦 919 48 76ms 6 Jun 2022 808th JayXon 🇺🇸 919 48 70ms 20 Mar 2023 808th Steffan153 🇫🇮 919 48 75ms 21 Mar 2023 808th Yewzir 🇧🇪 919 48 74ms 5 Mar 2024 808th jipsong 🇩🇪 919 48 67ms 10 Jun 2024 808th pardouin 🇫🇷 919 48 68ms 3 Sep 2024 808th sean-niemann 🇺🇸 919 48 67ms 18 Apr 2025 816th pardouin 🇫🇷 918 42 3,715ms 23 Oct 2024 816th inventshah 918 42 4,469ms 24 Oct 2024 816th DialFrost 🇸🇬 918 42 3,642ms 24 Oct 2024 816th stefangimmillaro 918 42 4,633ms 24 Oct 2024 816th btnlq 918 42 3,889ms 25 Oct 2024 816th JayXon 🇺🇸 918 42 3,857ms 27 Oct 2024 816th sean-niemann 🇺🇸 918 42 4,068ms 29 Oct 2024 816th emgordon154 918 42 4,495ms 20 Mar 2025 816th snoozingnewt 🇨🇦 918 42 4,166ms 20 Oct 2025 825th rucin93 🇵🇱 918 61 419ms 24 Sep 2025 825th Shanethegamer 🇺🇸 918 61 416ms 25 Sep 2025 825th FlyingPenguin223 918 61 435ms 25 Sep 2025 825th emgordon154 918 61 394ms 25 Sep 2025 825th voytxt 🇨🇿 918 61 432ms 25 Sep 2025 825th MeWhenI 🇻🇦 918 61 439ms 7 Nov 2025 825th dokutan 918 61 376ms 17 days ago 832nd jared-hughes 918 68 52ms 20 Jul 2022 832nd m-tkach 🇺🇦 918 68 52ms 15 Aug 2022 832nd 09cf 918 68 64ms 23 days ago 835th GrayJoKing 🇦🇺 916 34 333ms 19 Nov 2022 835th Betuaredead 916 34 397ms 14 Nov 2023 835th Yewzir 🇧🇪 916 34 412ms 14 Nov 2023 835th Shanethegamer 🇺🇸 916 34 412ms 10 Dec 2023 835th pardouin 🇫🇷 916 34 405ms 14 Sep 2024 840th Steffan153 🇫🇮 916 52 154ms 7 Aug 2024 841st SirBogman 🇺🇸 915 39 347ms 15 Jan 2024 841st AlephSquirrel 915 39 372ms 16 Jan 2024 841st namelessiw 915 39 366ms 23 Jan 2024 841st dokutan 915 39 374ms 26 Mar 2024 841st alemelis 915 39 411ms 4 Oct 2024 841st CornerMercury 🇬🇧 915 39 339ms 12 Oct 2025 841st snoozingnewt 🇨🇦 915 39 318ms 20 Oct 2025 841st GolfingSuccess 🇬🇷 915 39 372ms 19 days ago 841st BREMAUCY 🇫🇷 915 39 341ms 12 days ago 850th Lydxn 🇨🇦 915 49 35ms 13 Jun 2022 850th primo-ppcg 🇹🇭 915 49 36ms 13 Jun 2022 850th GrayJoKing 🇦🇺 915 49 37ms 22 Jun 2022 850th JayXon 🇺🇸 915 49 35ms 9 Sep 2022 850th MeWhenI 🇻🇦 915 49 34ms 5 Nov 2022 850th Steffan153 🇫🇮 915 49 37ms 27 Nov 2022 850th DialFrost 🇸🇬 915 49 36ms 13 Jan 2023 850th sean-niemann 🇺🇸 915 49 37ms 21 Apr 2023 850th prplz 🇦🇺 915 49 34ms 22 May 2023 850th Yewzir 🇧🇪 915 49 35ms 12 Oct 2023 850th Betuaredead 915 49 34ms 11 Nov 2023 850th pardouin 🇫🇷 915 49 36ms 5 Oct 2024 850th fuzzylojik-golf 🇺🇸 915 49 37ms 6 Sep 2025 850th CaedenHarper 🇨🇦 915 49 38ms 27 Oct 2025 864th kkoenig 915 50 1ms 4 Jan 2024 864th namelessiw 915 50 1ms 11 Mar 2024 864th dokutan 915 50 1ms 27 Apr 2024 864th FlyingPenguin223 915 50 1ms 18 Dec 2024 864th Yax42 🇫🇷 915 50 2ms 3 Oct 2025 864th Babafaba 915 50 1ms 18 Oct 2025 864th ApoChagi 915 50 1ms 19 Oct 2025 871st UnderKoen 🇳🇱 915 58 1ms 6 Jul 2022 871st sisyphus-ppcg 🇦🇺 915 58 1ms 7 Jul 2022 871st m-tkach 🇺🇦 915 58 1ms 8 Mar 2023 871st orthoplex 🇨🇽 915 58 1ms 29 Jun 2023 871st Lydxn 🇨🇦 915 58 1ms 19 Jul 2023 876th Natanaelel 🇸🇪 914 36 8ms 25 Jun 2022 876th scpchicken 🇵🇼 914 36 9ms 25 Feb 2023 876th Yax42 🇫🇷 914 36 9ms 5 Sep 2025 879th Steffan153 🇫🇮 914 40 3ms 12 Aug 2024 879th btnlq 914 40 3ms 18 Aug 2024 First Prev 801–880 of 3,296 Next Last