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 879th sean-niemann 🇺🇸 914 40 4ms 11 Oct 2024 882nd marshallward 🇺🇸 913 49 39ms 20 Nov 2022 883rd prplz 🇦🇺 912 39 77ms 10 Feb 2021 883rd GrayJoKing 🇦🇺 912 39 78ms 11 Feb 2021 883rd sisyphus-ppcg 🇦🇺 912 39 77ms 30 May 2021 883rd lynn 912 39 77ms 11 Sep 2021 883rd inventshah 912 39 76ms 18 Jun 2022 883rd MWI-polygolf 912 39 79ms 18 Feb 2023 883rd steffan-polygolf 912 39 77ms 19 Feb 2023 883rd rucin93 🇵🇱 912 39 77ms 23 Apr 2023 883rd Yax42 🇫🇷 912 39 78ms 4 Oct 2025 892nd Lydxn 🇨🇦 912 60 387ms 27 Feb 2022 892nd JayXon 🇺🇸 912 60 448ms 27 Feb 2022 892nd GrayJoKing 🇦🇺 912 60 421ms 28 Feb 2022 892nd lynn 912 60 438ms 3 Jun 2022 892nd sean-niemann 🇺🇸 912 60 487ms 4 Nov 2022 892nd MeWhenI 🇻🇦 912 60 425ms 5 Nov 2022 892nd Steffan153 🇫🇮 912 60 436ms 1 Jan 2023 892nd DialFrost 🇸🇬 912 60 462ms 13 Jan 2023 892nd Shanethegamer 🇺🇸 912 60 497ms 6 Feb 2023 892nd sisyphus-ppcg 🇦🇺 912 60 441ms 23 Mar 2023 892nd prplz 🇦🇺 912 60 460ms 22 May 2023 892nd ovs-code 🇩🇪 912 60 435ms 17 Jul 2023 892nd Yewzir 🇧🇪 912 60 420ms 11 Oct 2023 892nd Betuaredead 912 60 432ms 11 Nov 2023 892nd pardouin 🇫🇷 912 60 465ms 18 Aug 2024 892nd fuzzylojik-golf 🇺🇸 912 60 503ms 18 Jul 2025 892nd edsrzf 🇳🇿 912 60 432ms 4 Sep 2025 892nd snoozingnewt 🇨🇦 912 60 451ms 20 Oct 2025 910th Lydxn 🇨🇦 911 50 5ms 20 Dec 2023 911th Lydxn 🇨🇦 911 68 24ms 16 Apr 2022 911th JayXon 🇺🇸 911 68 24ms 17 Apr 2022 911th prplz 🇦🇺 911 68 24ms 17 Apr 2022 911th primo-ppcg 🇹🇭 911 68 25ms 25 Jun 2022 911th m-tkach 🇺🇦 911 68 25ms 26 Jun 2022 911th emplv 🇱🇻 911 68 25ms 22 Nov 2022 911th Steffan153 🇫🇮 911 68 24ms 24 Jan 2023 911th DialFrost 🇸🇬 911 68 25ms 5 Feb 2023 911th GrayJoKing 🇦🇺 911 68 26ms 19 Mar 2023 911th Shanethegamer 🇺🇸 911 68 25ms 19 Mar 2023 911th sean-niemann 🇺🇸 911 68 25ms 13 Apr 2023 911th Betuaredead 911 68 23ms 13 Nov 2023 911th Yewzir 🇧🇪 911 68 25ms 14 Nov 2023 911th pardouin 🇫🇷 911 68 23ms 19 Aug 2024 911th edsrzf 🇳🇿 911 68 26ms 22 Jul 2025 911th fuzzylojik-golf 🇺🇸 911 68 25ms 20 Aug 2025 911th snoozingnewt 🇨🇦 911 68 24ms 12 days ago 928th Lydxn 🇨🇦 909 51 3ms 16 Jul 2023 928th GrayJoKing 🇦🇺 909 51 3ms 16 Jul 2023 928th MeWhenI 🇻🇦 909 51 4ms 16 Jul 2023 928th Steffan153 🇫🇮 909 51 3ms 16 Jul 2023 928th btnlq 909 51 3ms 16 Jul 2023 928th ovs-code 🇩🇪 909 51 3ms 17 Jul 2023 928th sean-niemann 🇺🇸 909 51 4ms 12 Jun 2025 928th fuzzylojik-golf 🇺🇸 909 51 4ms 17 Sep 2025 936th canissimia 🇦🇶 906 139 2ms 10 Jul 2021 937th dokutan 905 57 318ms 26 Mar 2024 938th prplz 🇦🇺 905 62 25ms 26 Dec 2022 938th Steffan153 🇫🇮 905 62 26ms 26 Dec 2022 938th GrayJoKing 🇦🇺 905 62 25ms 4 Jan 2023 938th DialFrost 🇸🇬 905 62 27ms 12 Jan 2023 938th m-tkach 🇺🇦 905 62 25ms 12 Jan 2023 938th Lydxn 🇨🇦 905 62 26ms 13 Jan 2023 938th MeWhenI 🇻🇦 905 62 25ms 14 Jan 2023 938th Shanethegamer 🇺🇸 905 62 25ms 6 Feb 2023 938th lynn 905 62 25ms 12 Jul 2023 938th Yewzir 🇧🇪 905 62 25ms 12 Oct 2023 938th Betuaredead 905 62 25ms 11 Nov 2023 938th pardouin 🇫🇷 905 62 26ms 19 Aug 2024 938th sean-niemann 🇺🇸 905 62 26ms 19 May 2025 938th edsrzf 🇳🇿 905 62 25ms 22 Jul 2025 938th snoozingnewt 🇨🇦 905 62 25ms 22 Oct 2025 953rd FlyingPenguin223 905 69 75ms 18 Dec 2024 954th MeWhenI 🇻🇦 904 38 2ms 5 Nov 2022 954th snoozingnewt 🇨🇦 904 38 3ms 22 Oct 2025 956th Shanethegamer 🇺🇸 903 37 124ms 22 Apr 2025 956th snoozingnewt 🇨🇦 903 37 113ms 8 days ago 958th Steffan153 🇫🇮 903 41 6ms 16 Apr 2023 958th Shanethegamer 🇺🇸 903 41 4ms 16 Apr 2023 958th inventshah 903 41 4ms 16 Apr 2023 First Prev 881–960 of 3,296 Next Last