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 544th Yewzir 🇧🇪 932 67 60ms 11 Oct 2023 544th Betuaredead 932 67 57ms 11 Nov 2023 544th pardouin 🇫🇷 932 67 50ms 17 Aug 2024 544th b-illy 🇬🇧 932 67 71ms 5 Jun 2025 544th fuzzylojik-golf 🇺🇸 932 67 68ms 19 Aug 2025 544th edsrzf 🇳🇿 932 67 63ms 4 Sep 2025 544th CaedenHarper 🇨🇦 932 67 80ms 4 Sep 2025 544th KasperKivimaeki 🇫🇮 932 67 65ms 18 Nov 2025 544th snoozingnewt 🇨🇦 932 67 59ms 15 days ago 570th JayXon 🇺🇸 931 41 118ms 9 Feb 2021 570th GrayJoKing 🇦🇺 931 41 127ms 9 Feb 2021 570th primo-ppcg 🇹🇭 931 41 121ms 9 Feb 2021 570th prplz 🇦🇺 931 41 125ms 10 Feb 2021 570th sisyphus-ppcg 🇦🇺 931 41 124ms 10 Feb 2021 570th Lydxn 🇨🇦 931 41 119ms 10 Feb 2021 570th lynn 931 41 119ms 11 Sep 2021 570th m-tkach 🇺🇦 931 41 117ms 24 Oct 2022 570th sean-niemann 🇺🇸 931 41 117ms 3 Nov 2022 570th MeWhenI 🇻🇦 931 41 117ms 5 Nov 2022 570th Steffan153 🇫🇮 931 41 121ms 3 Dec 2022 570th DialFrost 🇸🇬 931 41 117ms 12 Jan 2023 570th Shanethegamer 🇺🇸 931 41 122ms 6 Feb 2023 570th MWI-polygolf 931 41 121ms 18 Feb 2023 570th steffan-polygolf 931 41 124ms 19 Feb 2023 570th stefangimmillaro 931 41 123ms 11 Jun 2023 570th ovs-code 🇩🇪 931 41 120ms 17 Jul 2023 570th Yewzir 🇧🇪 931 41 125ms 20 Oct 2023 570th Betuaredead 931 41 117ms 11 Nov 2023 570th dokutan 931 41 118ms 26 Mar 2024 570th pardouin 🇫🇷 931 41 125ms 17 Aug 2024 570th edsrzf 🇳🇿 931 41 122ms 22 Jul 2025 570th rucin93 🇵🇱 931 41 123ms 24 Jul 2025 570th fuzzylojik-golf 🇺🇸 931 41 116ms 7 Aug 2025 570th snoozingnewt 🇨🇦 931 41 183ms 15 days ago 595th NewDefectus 🇮🇱 928 22 33ms 10 Oct 2021 595th yzhs 🇩🇪 928 22 35ms 20 Jul 2022 595th saltysylvi 928 22 34ms 5 Aug 2022 595th ashtraypettingzoo 🇺🇸 928 22 33ms 22 Feb 2023 595th MeWhenI 🇻🇦 928 22 33ms 7 Aug 2023 595th Yewzir 🇧🇪 928 22 33ms 6 Nov 2023 595th Natanaelel 🇸🇪 928 22 35ms 28 Nov 2023 595th orthoplex 🇨🇽 928 22 33ms 20 Jul 2024 603rd o0lit3 🇺🇸 928 25 219ms 11 Feb 2021 603rd SirBogman 🇺🇸 928 25 115ms 31 May 2022 605th JayXon 🇺🇸 928 36 122ms 4 Aug 2024 605th Steffan153 🇫🇮 928 36 123ms 4 Aug 2024 605th sean-niemann 🇺🇸 928 36 118ms 5 Aug 2024 605th lukegustafson 🇺🇸 928 36 121ms 5 Aug 2024 605th Lydxn 🇨🇦 928 36 122ms 6 Aug 2024 605th rucin93 🇵🇱 928 36 123ms 6 Aug 2024 605th MeWhenI 🇻🇦 928 36 119ms 6 Aug 2024 605th sisyphus-ppcg 🇦🇺 928 36 118ms 8 Aug 2024 605th GrayJoKing 🇦🇺 928 36 125ms 13 Aug 2024 605th DialFrost 🇸🇬 928 36 124ms 20 Aug 2024 605th pardouin 🇫🇷 928 36 118ms 3 Sep 2024 605th emplv 🇱🇻 928 36 123ms 29 Oct 2024 605th fuzzylojik-golf 🇺🇸 928 36 128ms 2 Aug 2025 605th Yewzir 🇧🇪 928 36 124ms 18 Nov 2025 619th Lydxn 🇨🇦 928 37 3ms 29 Sep 2022 619th GrayJoKing 🇦🇺 928 37 3ms 29 Sep 2022 619th DialFrost 🇸🇬 928 37 3ms 24 Jan 2023 619th Steffan153 🇫🇮 928 37 3ms 3 Feb 2023 619th sisyphus-ppcg 🇦🇺 928 37 2ms 4 Feb 2023 619th prplz 🇦🇺 928 37 3ms 18 May 2023 619th ovs-code 🇩🇪 928 37 3ms 17 Jul 2023 619th sean-niemann 🇺🇸 928 37 3ms 23 Oct 2023 619th xsot 🇸🇬 928 37 2ms 8 Feb 2024 619th Yewzir 🇧🇪 928 37 2ms 2 Mar 2024 619th pardouin 🇫🇷 928 37 3ms 20 Aug 2024 619th edsrzf 🇳🇿 928 37 3ms 4 Sep 2025 631st inventshah 927 40 1ms 30 Oct 2022 631st Lydxn 🇨🇦 927 40 1ms 30 Oct 2022 631st GrayJoKing 🇦🇺 927 40 1ms 3 Nov 2022 631st sisyphus-ppcg 🇦🇺 927 40 2ms 3 Nov 2022 631st sean-niemann 🇺🇸 927 40 1ms 4 Nov 2022 631st btnlq 927 40 2ms 5 Nov 2022 631st MeWhenI 🇻🇦 927 40 1ms 5 Nov 2022 631st primo-ppcg 🇹🇭 927 40 1ms 6 Nov 2022 631st Steffan153 🇫🇮 927 40 1ms 26 Nov 2022 631st DialFrost 🇸🇬 927 40 2ms 12 Jan 2023 First Prev 561–640 of 3,299 Next Last