The Calendar hole will go live in approximately 8 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 539th edsrzf 🇳🇿 932 67 63ms 4 Sep 2025 539th CaedenHarper 🇨🇦 932 67 80ms 4 Sep 2025 539th KasperKivimaeki 🇫🇮 932 67 65ms 18 Nov 2025 539th snoozingnewt 🇨🇦 932 67 59ms 20 days ago 565th JayXon 🇺🇸 931 41 118ms 9 Feb 2021 565th GrayJoKing 🇦🇺 931 41 127ms 9 Feb 2021 565th primo-ppcg 🇹🇭 931 41 121ms 9 Feb 2021 565th prplz 🇦🇺 931 41 125ms 10 Feb 2021 565th sisyphus-ppcg 🇦🇺 931 41 124ms 10 Feb 2021 565th Lydxn 🇨🇦 931 41 119ms 10 Feb 2021 565th lynn 931 41 119ms 11 Sep 2021 565th m-tkach 🇺🇦 931 41 117ms 24 Oct 2022 565th sean-niemann 🇺🇸 931 41 117ms 3 Nov 2022 565th MeWhenI 🇻🇦 931 41 117ms 5 Nov 2022 565th Steffan153 🇫🇮 931 41 121ms 3 Dec 2022 565th DialFrost 🇸🇬 931 41 117ms 12 Jan 2023 565th Shanethegamer 🇺🇸 931 41 122ms 6 Feb 2023 565th MWI-polygolf 931 41 121ms 18 Feb 2023 565th steffan-polygolf 931 41 124ms 19 Feb 2023 565th stefangimmillaro 931 41 123ms 11 Jun 2023 565th ovs-code 🇩🇪 931 41 120ms 17 Jul 2023 565th Yewzir 🇧🇪 931 41 125ms 20 Oct 2023 565th Betuaredead 931 41 117ms 11 Nov 2023 565th dokutan 931 41 118ms 26 Mar 2024 565th pardouin 🇫🇷 931 41 125ms 17 Aug 2024 565th edsrzf 🇳🇿 931 41 122ms 22 Jul 2025 565th rucin93 🇵🇱 931 41 123ms 24 Jul 2025 565th fuzzylojik-golf 🇺🇸 931 41 116ms 7 Aug 2025 565th snoozingnewt 🇨🇦 931 41 183ms 20 days ago 590th NewDefectus 🇮🇱 928 22 33ms 10 Oct 2021 590th yzhs 🇩🇪 928 22 35ms 20 Jul 2022 590th saltysylvi 928 22 34ms 5 Aug 2022 590th ashtraypettingzoo 🇺🇸 928 22 33ms 22 Feb 2023 590th MeWhenI 🇻🇦 928 22 33ms 7 Aug 2023 590th Yewzir 🇧🇪 928 22 33ms 6 Nov 2023 590th Natanaelel 🇸🇪 928 22 35ms 28 Nov 2023 590th orthoplex 🇨🇽 928 22 33ms 20 Jul 2024 598th o0lit3 🇺🇸 928 25 115ms 11 Feb 2021 598th SirBogman 🇺🇸 928 25 114ms 31 May 2022 600th JayXon 🇺🇸 928 36 122ms 4 Aug 2024 600th Steffan153 🇫🇮 928 36 123ms 4 Aug 2024 600th sean-niemann 🇺🇸 928 36 118ms 5 Aug 2024 600th lukegustafson 🇺🇸 928 36 121ms 5 Aug 2024 600th Lydxn 🇨🇦 928 36 122ms 6 Aug 2024 600th rucin93 🇵🇱 928 36 123ms 6 Aug 2024 600th MeWhenI 🇻🇦 928 36 119ms 6 Aug 2024 600th sisyphus-ppcg 🇦🇺 928 36 118ms 8 Aug 2024 600th GrayJoKing 🇦🇺 928 36 125ms 13 Aug 2024 600th DialFrost 🇸🇬 928 36 124ms 20 Aug 2024 600th pardouin 🇫🇷 928 36 118ms 3 Sep 2024 600th emplv 🇱🇻 928 36 123ms 29 Oct 2024 600th fuzzylojik-golf 🇺🇸 928 36 128ms 2 Aug 2025 600th Yewzir 🇧🇪 928 36 124ms 18 Nov 2025 614th Lydxn 🇨🇦 928 37 3ms 29 Sep 2022 614th GrayJoKing 🇦🇺 928 37 3ms 29 Sep 2022 614th DialFrost 🇸🇬 928 37 3ms 24 Jan 2023 614th Steffan153 🇫🇮 928 37 3ms 3 Feb 2023 614th sisyphus-ppcg 🇦🇺 928 37 2ms 4 Feb 2023 614th prplz 🇦🇺 928 37 3ms 18 May 2023 614th ovs-code 🇩🇪 928 37 3ms 17 Jul 2023 614th sean-niemann 🇺🇸 928 37 3ms 23 Oct 2023 614th xsot 🇸🇬 928 37 2ms 8 Feb 2024 614th Yewzir 🇧🇪 928 37 2ms 2 Mar 2024 614th pardouin 🇫🇷 928 37 3ms 20 Aug 2024 614th edsrzf 🇳🇿 928 37 3ms 4 Sep 2025 626th inventshah 927 40 1ms 30 Oct 2022 626th Lydxn 🇨🇦 927 40 1ms 30 Oct 2022 626th GrayJoKing 🇦🇺 927 40 1ms 3 Nov 2022 626th sisyphus-ppcg 🇦🇺 927 40 2ms 3 Nov 2022 626th sean-niemann 🇺🇸 927 40 1ms 4 Nov 2022 626th btnlq 927 40 2ms 5 Nov 2022 626th MeWhenI 🇻🇦 927 40 1ms 5 Nov 2022 626th primo-ppcg 🇹🇭 927 40 1ms 6 Nov 2022 626th Steffan153 🇫🇮 927 40 1ms 26 Nov 2022 626th DialFrost 🇸🇬 927 40 2ms 12 Jan 2023 626th prplz 🇦🇺 927 40 1ms 12 Jan 2023 626th Shanethegamer 🇺🇸 927 40 1ms 6 Feb 2023 626th JayXon 🇺🇸 927 40 2ms 16 Mar 2023 626th xsot 🇸🇬 927 40 2ms 14 Jul 2023 626th Yewzir 🇧🇪 927 40 2ms 12 Oct 2023 First Prev 561–640 of 3,294 Next Last