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 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 472nd Yewzir 🇧🇪 933 29 35ms 25 Dec 2023 472nd GrayJoKing 🇦🇺 933 29 34ms 26 Dec 2023 472nd Lydxn 🇨🇦 933 29 37ms 29 Dec 2023 472nd xsot 🇸🇬 933 29 35ms 30 Dec 2023 472nd fuzzylojik-golf 🇺🇸 933 29 36ms 30 Aug 2025 472nd snoozingnewt 🇨🇦 933 29 41ms 14 days ago 487th Yewzir 🇧🇪 933 33 1ms 18 Nov 2025 487th sean-niemann 🇺🇸 933 33 1ms 18 Nov 2025 487th rucin93 🇵🇱 933 33 2ms 18 Nov 2025 487th edsrzf 🇳🇿 933 33 1ms 18 Nov 2025 487th DialFrost 🇸🇬 933 33 1ms 19 Nov 2025 487th JayXon 🇺🇸 933 33 1ms 19 Nov 2025 487th GrayJoKing 🇦🇺 933 33 1ms 19 Nov 2025 487th pardouin 🇫🇷 933 33 1ms 19 Nov 2025 487th snoozingnewt 🇨🇦 933 33 1ms 15 days ago 496th Lydxn 🇨🇦 933 34 3ms 12 May 2023 496th Steffan153 🇫🇮 933 34 4ms 14 May 2023 496th sean-niemann 🇺🇸 933 34 4ms 21 Apr 2025 499th GrayJoKing 🇦🇺 933 48 1ms 9 Feb 2021 499th prplz 🇦🇺 933 48 1ms 10 Feb 2021 499th NewDefectus 🇮🇱 933 48 1ms 8 May 2021 499th orthoplex 🇨🇽 933 48 1ms 12 Aug 2021 499th akshatj27 🇦🇶 933 48 1ms 11 Jan 2022 499th lynn 933 48 1ms 3 Jun 2022 499th AlephSquirrel 933 48 1ms 18 Jul 2022 499th stefangimmillaro 933 48 2ms 4 Nov 2022 499th MeWhenI 🇻🇦 933 48 1ms 5 Nov 2022 499th emplv 🇱🇻 933 48 1ms 22 Nov 2022 499th Steffan153 🇫🇮 933 48 1ms 26 Nov 2022 499th rucin93 🇵🇱 933 48 1ms 22 Jan 2023 499th voytxt 🇨🇿 933 48 1ms 19 Jan 2025 499th emgordon154 933 48 2ms 1 Jun 2025 499th edsrzf 🇳🇿 933 48 2ms 4 Sep 2025 514th Lydxn 🇨🇦 932 67 53ms 1 Jan 2022 514th prplz 🇦🇺 932 67 80ms 1 Jan 2022 514th JayXon 🇺🇸 932 67 57ms 1 Jan 2022 514th primo-ppcg 🇹🇭 932 67 73ms 18 Jan 2022 514th GrayJoKing 🇦🇺 932 67 75ms 18 Feb 2022 514th Irratix 🇳🇱 932 67 66ms 22 Mar 2022 514th inventshah 932 67 64ms 15 Jun 2022 514th sean-niemann 🇺🇸 932 67 56ms 4 Nov 2022 514th MeWhenI 🇻🇦 932 67 73ms 5 Nov 2022 514th Steffan153 🇫🇮 932 67 71ms 27 Nov 2022 514th DialFrost 🇸🇬 932 67 57ms 12 Jan 2023 514th Shanethegamer 🇺🇸 932 67 82ms 6 Feb 2023 514th Alex-x90 🇺🇸 932 67 64ms 24 Feb 2023 514th sisyphus-ppcg 🇦🇺 932 67 55ms 23 Mar 2023 514th rucin93 🇵🇱 932 67 65ms 20 Jun 2023 514th xsot 🇸🇬 932 67 63ms 14 Jul 2023 514th ovs-code 🇩🇪 932 67 72ms 17 Jul 2023 514th Yewzir 🇧🇪 932 67 60ms 11 Oct 2023 514th Betuaredead 932 67 57ms 11 Nov 2023 514th pardouin 🇫🇷 932 67 50ms 17 Aug 2024 514th b-illy 🇬🇧 932 67 71ms 5 Jun 2025 514th fuzzylojik-golf 🇺🇸 932 67 68ms 19 Aug 2025 514th edsrzf 🇳🇿 932 67 63ms 4 Sep 2025 514th CaedenHarper 🇨🇦 932 67 80ms 4 Sep 2025 514th KasperKivimaeki 🇫🇮 932 67 65ms 18 Nov 2025 514th snoozingnewt 🇨🇦 932 67 59ms 15 days ago 540th primo-ppcg 🇹🇭 931 41 121ms 18 Jun 2019 540th JayXon 🇺🇸 931 41 118ms 9 Feb 2021 540th GrayJoKing 🇦🇺 931 41 127ms 9 Feb 2021 540th prplz 🇦🇺 931 41 125ms 10 Feb 2021 540th sisyphus-ppcg 🇦🇺 931 41 124ms 10 Feb 2021 540th Lydxn 🇨🇦 931 41 119ms 10 Feb 2021 540th lynn 931 41 119ms 11 Sep 2021 540th m-tkach 🇺🇦 931 41 117ms 24 Oct 2022 540th sean-niemann 🇺🇸 931 41 117ms 3 Nov 2022 540th MeWhenI 🇻🇦 931 41 117ms 5 Nov 2022 540th Steffan153 🇫🇮 931 41 121ms 3 Dec 2022 540th DialFrost 🇸🇬 931 41 117ms 12 Jan 2023 540th Shanethegamer 🇺🇸 931 41 122ms 6 Feb 2023 540th MWI-polygolf 931 41 121ms 18 Feb 2023 540th steffan-polygolf 931 41 124ms 19 Feb 2023 540th stefangimmillaro 931 41 123ms 11 Jun 2023 540th ovs-code 🇩🇪 931 41 120ms 17 Jul 2023 540th Yewzir 🇧🇪 931 41 125ms 20 Oct 2023 540th Betuaredead 931 41 117ms 11 Nov 2023 540th dokutan 931 41 118ms 26 Mar 2024 540th pardouin 🇫🇷 931 41 125ms 17 Aug 2024 First Prev 481–560 of 3,270 Next Last