The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
Pernicious Numbers (Long) 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 157th anter69 🇭🇺 937 54 16ms 2 Apr 2024 157th jatloe 937 54 23ms 24 Aug 2024 157th emgordon154 937 54 17ms 19 Mar 2025 157th andrewjc2000 937 54 22ms 4 Apr 2025 157th wuduculfre 937 54 16ms 22 Jul 2025 157th ApoChagi 937 54 25ms 18 Oct 2025 157th snoozingnewt 🇨🇦 937 54 16ms 13 days ago 168th JayXon 🇺🇸 936 44 59ms 20 Nov 2022 168th sisyphus-ppcg 🇦🇺 936 44 201ms 21 Nov 2022 168th Steffan153 🇫🇮 936 44 47ms 22 Nov 2022 168th m-tkach 🇺🇦 936 44 57ms 22 Nov 2022 168th ovs-code 🇩🇪 936 44 50ms 22 Nov 2022 168th nwellnhof 🇩🇪 936 44 53ms 26 Nov 2022 168th janlelis 936 44 47ms 29 Nov 2022 168th xsot 🇸🇬 936 44 52ms 11 Jun 2023 168th Natanaelel 🇸🇪 936 44 69ms 12 Jul 2023 168th MeWhenI 🇻🇦 936 44 184ms 7 Aug 2023 168th DialFrost 🇸🇬 936 44 65ms 31 May 2024 168th sean-niemann 🇺🇸 936 44 55ms 4 Aug 2025 168th fuzzylojik-golf 🇺🇸 936 44 48ms 20 Aug 2025 181st lukegustafson 🇺🇸 930 49 136ms 4 Aug 2024 181st JayXon 🇺🇸 930 49 142ms 5 Aug 2024 181st Lydxn 🇨🇦 930 49 135ms 8 Aug 2024 184th sisyphus-ppcg 🇦🇺 930 51 5ms 21 Jul 2023 185th JayXon 🇺🇸 930 55 5ms 27 Nov 2022 185th btnlq 930 55 5ms 28 Dec 2022 185th Lydxn 🇨🇦 930 55 5ms 20 Jul 2023 185th pardouin 🇫🇷 930 55 5ms 22 Apr 2025 189th JayXon 🇺🇸 930 69 339ms 21 Nov 2022 189th nwellnhof 🇩🇪 930 69 343ms 26 Nov 2022 189th stefangimmillaro 930 69 339ms 7 Feb 2023 189th sean-niemann 🇺🇸 930 69 369ms 7 Feb 2023 189th Lydxn 🇨🇦 930 69 342ms 7 Feb 2023 189th Steffan153 🇫🇮 930 69 335ms 7 Feb 2023 189th AdrienHache 🇫🇷 930 69 339ms 3 Nov 2023 189th namelessiw 930 69 388ms 14 Jun 2024 189th pardouin 🇫🇷 930 69 404ms 24 Apr 2025 198th DialFrost 🇸🇬 930 75 364ms 24 Sep 2025 198th pardouin 🇫🇷 930 75 600ms 24 Sep 2025 198th rucin93 🇵🇱 930 75 493ms 24 Sep 2025 198th sean-niemann 🇺🇸 930 75 450ms 24 Sep 2025 198th JayXon 🇺🇸 930 75 420ms 24 Sep 2025 198th nwellnhof 🇩🇪 930 75 401ms 25 Sep 2025 198th namelessiw 930 75 439ms 2 Oct 2025 198th stefangimmillaro 930 75 597ms 6 Oct 2025 198th Lydxn 🇨🇦 930 75 360ms 6 days ago 207th ovs-code 🇩🇪 929 51 363ms 15 Jan 2024 207th inventshah 929 51 366ms 15 Jan 2024 207th GrayJoKing 🇦🇺 929 51 355ms 15 Jan 2024 207th sisyphus-ppcg 🇦🇺 929 51 382ms 17 Jan 2024 207th AlephSquirrel 929 51 343ms 22 Jan 2024 207th lynn 929 51 358ms 17 Feb 2024 207th duckyluuk 🇳🇱 929 51 364ms 27 Mar 2024 207th fuzzylojik-golf 🇺🇸 929 51 345ms 20 Aug 2025 215th pardouin 🇫🇷 929 58 4ms 31 May 2025 216th sean-niemann 🇺🇸 928 46 703ms 12 Sep 2025 216th DialFrost 🇸🇬 928 46 742ms 13 Sep 2025 216th CaedenHarper 🇨🇦 928 46 741ms 17 Oct 2025 216th pardouin 🇫🇷 928 46 734ms 17 days ago 220th btnlq 927 48 69ms 26 Aug 2024 221st nwellnhof 🇩🇪 927 79 64ms 27 Nov 2022 221st Lydxn 🇨🇦 927 79 77ms 4 Mar 2024 221st JayXon 🇺🇸 927 79 77ms 4 Mar 2024 224th stefangimmillaro 926 74 125ms 20 Nov 2022 224th primo-ppcg 🇹🇭 926 74 121ms 20 Nov 2022 224th JayXon 🇺🇸 926 74 120ms 20 Nov 2022 224th Lydxn 🇨🇦 926 74 120ms 20 Nov 2022 224th inventshah 926 74 120ms 22 Nov 2022 224th Steffan153 🇫🇮 926 74 122ms 14 Jan 2023 224th sean-niemann 🇺🇸 926 74 125ms 12 Jun 2023 224th ovs-code 🇩🇪 926 74 121ms 23 Jun 2023 224th acotis 926 74 122ms 4 Feb 2025 224th lynn 926 74 119ms 4 Apr 2025 224th DialFrost 🇸🇬 926 74 123ms 5 Apr 2025 224th pardouin 🇫🇷 926 74 128ms 20 Apr 2025 224th fuzzylojik-golf 🇺🇸 926 74 122ms 29 Aug 2025 224th kumavale 926 74 120ms 4 Sep 2025 238th GrayJoKing 🇦🇺 925 54 17ms 26 Oct 2023 238th JayXon 🇺🇸 925 54 17ms 26 Oct 2023 238th Lydxn 🇨🇦 925 54 17ms 26 Oct 2023 First Prev 161–240 of 1,816 Next Last