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 542nd pardouin 🇫🇷 932 67 50ms 17 Aug 2024 542nd b-illy 🇬🇧 932 67 71ms 5 Jun 2025 542nd fuzzylojik-golf 🇺🇸 932 67 68ms 19 Aug 2025 542nd edsrzf 🇳🇿 932 67 63ms 4 Sep 2025 542nd CaedenHarper 🇨🇦 932 67 80ms 4 Sep 2025 542nd KasperKivimaeki 🇫🇮 932 67 65ms 18 Nov 2025 542nd snoozingnewt 🇨🇦 932 67 59ms 15 days ago 568th JayXon 🇺🇸 931 41 118ms 9 Feb 2021 568th GrayJoKing 🇦🇺 931 41 127ms 9 Feb 2021 568th primo-ppcg 🇹🇭 931 41 121ms 9 Feb 2021 568th prplz 🇦🇺 931 41 125ms 10 Feb 2021 568th sisyphus-ppcg 🇦🇺 931 41 124ms 10 Feb 2021 568th Lydxn 🇨🇦 931 41 119ms 10 Feb 2021 568th lynn 931 41 119ms 11 Sep 2021 568th m-tkach 🇺🇦 931 41 117ms 24 Oct 2022 568th sean-niemann 🇺🇸 931 41 117ms 3 Nov 2022 568th MeWhenI 🇻🇦 931 41 117ms 5 Nov 2022 568th Steffan153 🇫🇮 931 41 121ms 3 Dec 2022 568th DialFrost 🇸🇬 931 41 117ms 12 Jan 2023 568th Shanethegamer 🇺🇸 931 41 122ms 6 Feb 2023 568th MWI-polygolf 931 41 121ms 18 Feb 2023 568th steffan-polygolf 931 41 124ms 19 Feb 2023 568th stefangimmillaro 931 41 123ms 11 Jun 2023 568th ovs-code 🇩🇪 931 41 120ms 17 Jul 2023 568th Yewzir 🇧🇪 931 41 125ms 20 Oct 2023 568th Betuaredead 931 41 117ms 11 Nov 2023 568th dokutan 931 41 118ms 26 Mar 2024 568th pardouin 🇫🇷 931 41 125ms 17 Aug 2024 568th edsrzf 🇳🇿 931 41 122ms 22 Jul 2025 568th rucin93 🇵🇱 931 41 123ms 24 Jul 2025 568th fuzzylojik-golf 🇺🇸 931 41 116ms 7 Aug 2025 568th snoozingnewt 🇨🇦 931 41 183ms 15 days ago 593rd NewDefectus 🇮🇱 928 22 33ms 10 Oct 2021 593rd yzhs 🇩🇪 928 22 35ms 20 Jul 2022 593rd saltysylvi 928 22 34ms 5 Aug 2022 593rd ashtraypettingzoo 🇺🇸 928 22 33ms 22 Feb 2023 593rd MeWhenI 🇻🇦 928 22 33ms 7 Aug 2023 593rd Yewzir 🇧🇪 928 22 33ms 6 Nov 2023 593rd Natanaelel 🇸🇪 928 22 35ms 28 Nov 2023 593rd orthoplex 🇨🇽 928 22 33ms 20 Jul 2024 601st o0lit3 🇺🇸 928 25 219ms 11 Feb 2021 601st SirBogman 🇺🇸 928 25 115ms 31 May 2022 603rd JayXon 🇺🇸 928 36 122ms 4 Aug 2024 603rd Steffan153 🇫🇮 928 36 123ms 4 Aug 2024 603rd sean-niemann 🇺🇸 928 36 118ms 5 Aug 2024 603rd lukegustafson 🇺🇸 928 36 121ms 5 Aug 2024 603rd Lydxn 🇨🇦 928 36 122ms 6 Aug 2024 603rd rucin93 🇵🇱 928 36 123ms 6 Aug 2024 603rd MeWhenI 🇻🇦 928 36 119ms 6 Aug 2024 603rd sisyphus-ppcg 🇦🇺 928 36 118ms 8 Aug 2024 603rd GrayJoKing 🇦🇺 928 36 125ms 13 Aug 2024 603rd DialFrost 🇸🇬 928 36 124ms 20 Aug 2024 603rd pardouin 🇫🇷 928 36 118ms 3 Sep 2024 603rd emplv 🇱🇻 928 36 123ms 29 Oct 2024 603rd fuzzylojik-golf 🇺🇸 928 36 128ms 2 Aug 2025 603rd Yewzir 🇧🇪 928 36 124ms 18 Nov 2025 617th Lydxn 🇨🇦 928 37 3ms 29 Sep 2022 617th GrayJoKing 🇦🇺 928 37 3ms 29 Sep 2022 617th DialFrost 🇸🇬 928 37 3ms 24 Jan 2023 617th Steffan153 🇫🇮 928 37 3ms 3 Feb 2023 617th sisyphus-ppcg 🇦🇺 928 37 2ms 4 Feb 2023 617th prplz 🇦🇺 928 37 3ms 18 May 2023 617th ovs-code 🇩🇪 928 37 3ms 17 Jul 2023 617th sean-niemann 🇺🇸 928 37 3ms 23 Oct 2023 617th xsot 🇸🇬 928 37 2ms 8 Feb 2024 617th Yewzir 🇧🇪 928 37 2ms 2 Mar 2024 617th pardouin 🇫🇷 928 37 3ms 20 Aug 2024 617th edsrzf 🇳🇿 928 37 3ms 4 Sep 2025 629th inventshah 927 40 1ms 30 Oct 2022 629th Lydxn 🇨🇦 927 40 1ms 30 Oct 2022 629th GrayJoKing 🇦🇺 927 40 1ms 3 Nov 2022 629th sisyphus-ppcg 🇦🇺 927 40 2ms 3 Nov 2022 629th sean-niemann 🇺🇸 927 40 1ms 4 Nov 2022 629th btnlq 927 40 2ms 5 Nov 2022 629th MeWhenI 🇻🇦 927 40 1ms 5 Nov 2022 629th primo-ppcg 🇹🇭 927 40 1ms 6 Nov 2022 629th Steffan153 🇫🇮 927 40 1ms 26 Nov 2022 629th DialFrost 🇸🇬 927 40 2ms 12 Jan 2023 629th prplz 🇦🇺 927 40 1ms 12 Jan 2023 629th Shanethegamer 🇺🇸 927 40 1ms 6 Feb 2023 First Prev 561–640 of 3,296 Next Last