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 chars. 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 Chars Time Submitted 397th sisyphus-ppcg 🇦🇺 936 41 1ms 10 Feb 2021 397th Waffle3z 936 41 2ms 10 Feb 2021 397th orthoplex 🇨🇽 936 41 1ms 12 Aug 2021 397th jared-hughes 936 41 2ms 28 Feb 2022 397th m-tkach 🇺🇦 936 41 2ms 24 Oct 2022 397th MeWhenI 🇻🇦 936 41 2ms 5 Nov 2022 397th DialFrost 🇸🇬 936 41 2ms 12 Jan 2023 397th sean-niemann 🇺🇸 936 41 2ms 12 Jan 2023 397th Shanethegamer 🇺🇸 936 41 2ms 6 Feb 2023 397th xsot 🇸🇬 936 41 2ms 9 Oct 2023 397th dokutan 936 41 2ms 26 Mar 2024 397th pardouin 🇫🇷 936 41 2ms 21 Sep 2024 397th FlyingPenguin223 936 41 2ms 23 Oct 2024 397th fuzzylojik-golf 🇺🇸 936 41 2ms 3 Jul 2025 397th edsrzf 🇳🇿 936 41 2ms 22 Jul 2025 397th snoozingnewt 🇨🇦 936 41 2ms 19 days ago 417th prplz 🇦🇺 935 55 118ms 13 Jan 2022 417th GrayJoKing 🇦🇺 935 55 118ms 13 Jan 2022 417th JayXon 🇺🇸 935 55 122ms 13 Jan 2022 417th Lydxn 🇨🇦 935 55 121ms 13 Jan 2022 417th primo-ppcg 🇹🇭 935 55 126ms 14 Jan 2022 417th lynn 935 55 119ms 10 Mar 2022 417th inventshah 935 55 120ms 15 Jun 2022 417th sisyphus-ppcg 🇦🇺 935 55 126ms 8 Aug 2022 417th sean-niemann 🇺🇸 935 55 122ms 3 Nov 2022 417th stefangimmillaro 935 55 131ms 4 Nov 2022 417th andersk 🇺🇸 935 55 118ms 5 Nov 2022 417th MeWhenI 🇻🇦 935 55 118ms 6 Nov 2022 417th Steffan153 🇫🇮 935 55 123ms 27 Nov 2022 417th DialFrost 🇸🇬 935 55 118ms 12 Jan 2023 417th rucin93 🇵🇱 935 55 115ms 19 Jan 2023 417th Shanethegamer 🇺🇸 935 55 116ms 6 Feb 2023 417th ovs-code 🇩🇪 935 55 133ms 17 Jul 2023 417th Yewzir 🇧🇪 935 55 120ms 11 Oct 2023 417th Betuaredead 935 55 114ms 11 Nov 2023 417th dokutan 935 55 120ms 27 Mar 2024 417th pardouin 🇫🇷 935 55 117ms 19 Aug 2024 417th acotis 935 55 120ms 4 Feb 2025 417th emgordon154 935 55 123ms 19 Mar 2025 417th fuzzylojik-golf 🇺🇸 935 55 116ms 17 Jun 2025 417th edsrzf 🇳🇿 935 55 117ms 22 Jul 2025 417th kumavale 935 55 120ms 26 Aug 2025 417th snoozingnewt 🇨🇦 935 55 115ms 20 Oct 2025 444th henkma 934 51 111ms 26 Jun 2020 444th lynn 934 51 113ms 8 Oct 2021 446th edsrzf 🇳🇿 934 60 540ms 26 Sep 2025 446th DialFrost 🇸🇬 934 60 442ms 26 Sep 2025 446th sean-niemann 🇺🇸 934 60 455ms 26 Sep 2025 446th JayXon 🇺🇸 934 60 435ms 26 Sep 2025 446th pardouin 🇫🇷 934 60 546ms 26 Sep 2025 446th fuzzylojik-golf 🇺🇸 934 60 488ms 26 Sep 2025 446th namelessiw 934 60 435ms 2 Oct 2025 446th Yewzir 🇧🇪 934 60 416ms 2 Oct 2025 446th Yax42 🇫🇷 934 60 502ms 3 Oct 2025 446th b-illy 🇬🇧 934 60 454ms 3 Oct 2025 446th ovs-code 🇩🇪 934 60 435ms 3 Oct 2025 446th CaedenHarper 🇨🇦 934 60 443ms 3 Oct 2025 446th m-tkach 🇺🇦 934 60 633ms 3 Oct 2025 446th stefangimmillaro 934 60 416ms 6 Oct 2025 446th snoozingnewt 🇨🇦 934 60 522ms 20 Oct 2025 446th sisyphus-ppcg 🇦🇺 934 60 485ms 27 days ago 446th Lydxn 🇨🇦 934 60 347ms 10 days ago 446th KasperKivimaeki 🇫🇮 934 60 377ms 10 days ago 464th rak1507 🇬🇧 933 18 2ms 11 Mar 2022 464th lynn 933 18 2ms 27 May 2022 464th Steffan153 🇫🇮 933 18 2ms 22 Feb 2023 464th pardouin 🇫🇷 933 18 2ms 16 Apr 2025 464th AdrienHache 🇫🇷 933 18 4ms 21 days ago 469th NewDefectus 🇮🇱 933 29 34ms 8 May 2021 469th akshatj27 🇦🇶 933 29 41ms 11 Jan 2022 469th m-tkach 🇺🇦 933 29 36ms 23 Nov 2022 469th Steffan153 🇫🇮 933 29 39ms 1 Jan 2023 469th DialFrost 🇸🇬 933 29 35ms 13 Jan 2023 469th sean-niemann 🇺🇸 933 29 43ms 29 Jan 2023 469th MeWhenI 🇻🇦 933 29 50ms 30 Jan 2023 469th JayXon 🇺🇸 933 29 32ms 25 Dec 2023 469th sisyphus-ppcg 🇦🇺 933 29 53ms 25 Dec 2023 469th Yewzir 🇧🇪 933 29 35ms 25 Dec 2023 469th GrayJoKing 🇦🇺 933 29 34ms 26 Dec 2023 469th Lydxn 🇨🇦 933 29 37ms 29 Dec 2023 First Prev 401–480 of 3,268 Next Last