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 543rd Betuaredead 932 67 57ms 11 Nov 2023 543rd pardouin 🇫🇷 932 67 50ms 17 Aug 2024 543rd b-illy 🇬🇧 932 67 71ms 5 Jun 2025 543rd fuzzylojik-golf 🇺🇸 932 67 68ms 19 Aug 2025 543rd edsrzf 🇳🇿 932 67 63ms 4 Sep 2025 543rd CaedenHarper 🇨🇦 932 67 80ms 4 Sep 2025 543rd KasperKivimaeki 🇫🇮 932 67 65ms 18 Nov 2025 543rd snoozingnewt 🇨🇦 932 67 59ms 15 days ago 569th JayXon 🇺🇸 931 41 118ms 9 Feb 2021 569th GrayJoKing 🇦🇺 931 41 127ms 9 Feb 2021 569th primo-ppcg 🇹🇭 931 41 121ms 9 Feb 2021 569th prplz 🇦🇺 931 41 125ms 10 Feb 2021 569th sisyphus-ppcg 🇦🇺 931 41 124ms 10 Feb 2021 569th Lydxn 🇨🇦 931 41 119ms 10 Feb 2021 569th lynn 931 41 119ms 11 Sep 2021 569th m-tkach 🇺🇦 931 41 117ms 24 Oct 2022 569th sean-niemann 🇺🇸 931 41 117ms 3 Nov 2022 569th MeWhenI 🇻🇦 931 41 117ms 5 Nov 2022 569th Steffan153 🇫🇮 931 41 121ms 3 Dec 2022 569th DialFrost 🇸🇬 931 41 117ms 12 Jan 2023 569th Shanethegamer 🇺🇸 931 41 122ms 6 Feb 2023 569th MWI-polygolf 931 41 121ms 18 Feb 2023 569th steffan-polygolf 931 41 124ms 19 Feb 2023 569th stefangimmillaro 931 41 123ms 11 Jun 2023 569th ovs-code 🇩🇪 931 41 120ms 17 Jul 2023 569th Yewzir 🇧🇪 931 41 125ms 20 Oct 2023 569th Betuaredead 931 41 117ms 11 Nov 2023 569th dokutan 931 41 118ms 26 Mar 2024 569th pardouin 🇫🇷 931 41 125ms 17 Aug 2024 569th edsrzf 🇳🇿 931 41 122ms 22 Jul 2025 569th rucin93 🇵🇱 931 41 123ms 24 Jul 2025 569th fuzzylojik-golf 🇺🇸 931 41 116ms 7 Aug 2025 569th snoozingnewt 🇨🇦 931 41 183ms 15 days ago 594th NewDefectus 🇮🇱 928 22 33ms 10 Oct 2021 594th yzhs 🇩🇪 928 22 35ms 20 Jul 2022 594th saltysylvi 928 22 34ms 5 Aug 2022 594th ashtraypettingzoo 🇺🇸 928 22 33ms 22 Feb 2023 594th MeWhenI 🇻🇦 928 22 33ms 7 Aug 2023 594th Yewzir 🇧🇪 928 22 33ms 6 Nov 2023 594th Natanaelel 🇸🇪 928 22 35ms 28 Nov 2023 594th orthoplex 🇨🇽 928 22 33ms 20 Jul 2024 602nd o0lit3 🇺🇸 928 25 219ms 11 Feb 2021 602nd SirBogman 🇺🇸 928 25 115ms 31 May 2022 604th JayXon 🇺🇸 928 36 122ms 4 Aug 2024 604th Steffan153 🇫🇮 928 36 123ms 4 Aug 2024 604th sean-niemann 🇺🇸 928 36 118ms 5 Aug 2024 604th lukegustafson 🇺🇸 928 36 121ms 5 Aug 2024 604th Lydxn 🇨🇦 928 36 122ms 6 Aug 2024 604th rucin93 🇵🇱 928 36 123ms 6 Aug 2024 604th MeWhenI 🇻🇦 928 36 119ms 6 Aug 2024 604th sisyphus-ppcg 🇦🇺 928 36 118ms 8 Aug 2024 604th GrayJoKing 🇦🇺 928 36 125ms 13 Aug 2024 604th DialFrost 🇸🇬 928 36 124ms 20 Aug 2024 604th pardouin 🇫🇷 928 36 118ms 3 Sep 2024 604th emplv 🇱🇻 928 36 123ms 29 Oct 2024 604th fuzzylojik-golf 🇺🇸 928 36 128ms 2 Aug 2025 604th Yewzir 🇧🇪 928 36 124ms 18 Nov 2025 618th Lydxn 🇨🇦 928 37 3ms 29 Sep 2022 618th GrayJoKing 🇦🇺 928 37 3ms 29 Sep 2022 618th DialFrost 🇸🇬 928 37 3ms 24 Jan 2023 618th Steffan153 🇫🇮 928 37 3ms 3 Feb 2023 618th sisyphus-ppcg 🇦🇺 928 37 2ms 4 Feb 2023 618th prplz 🇦🇺 928 37 3ms 18 May 2023 618th ovs-code 🇩🇪 928 37 3ms 17 Jul 2023 618th sean-niemann 🇺🇸 928 37 3ms 23 Oct 2023 618th xsot 🇸🇬 928 37 2ms 8 Feb 2024 618th Yewzir 🇧🇪 928 37 2ms 2 Mar 2024 618th pardouin 🇫🇷 928 37 3ms 20 Aug 2024 618th edsrzf 🇳🇿 928 37 3ms 4 Sep 2025 630th inventshah 927 40 1ms 30 Oct 2022 630th Lydxn 🇨🇦 927 40 1ms 30 Oct 2022 630th GrayJoKing 🇦🇺 927 40 1ms 3 Nov 2022 630th sisyphus-ppcg 🇦🇺 927 40 2ms 3 Nov 2022 630th sean-niemann 🇺🇸 927 40 1ms 4 Nov 2022 630th btnlq 927 40 2ms 5 Nov 2022 630th MeWhenI 🇻🇦 927 40 1ms 5 Nov 2022 630th primo-ppcg 🇹🇭 927 40 1ms 6 Nov 2022 630th Steffan153 🇫🇮 927 40 1ms 26 Nov 2022 630th DialFrost 🇸🇬 927 40 2ms 12 Jan 2023 630th prplz 🇦🇺 927 40 1ms 12 Jan 2023 First Prev 561–640 of 3,299 Next Last