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 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 542nd dokutan 931 41 118ms 26 Mar 2024 542nd pardouin 🇫🇷 931 41 125ms 17 Aug 2024 542nd edsrzf 🇳🇿 931 41 122ms 22 Jul 2025 542nd rucin93 🇵🇱 931 41 123ms 24 Jul 2025 542nd fuzzylojik-golf 🇺🇸 931 41 116ms 7 Aug 2025 542nd snoozingnewt 🇨🇦 931 41 183ms 16 days ago 567th o0lit3 🇺🇸 930 22 170ms 11 Feb 2021 567th SirBogman 🇺🇸 930 22 123ms 31 May 2022 567th Betuaredead 930 22 117ms 12 Nov 2023 567th snoozingnewt 🇨🇦 930 22 91ms 15 days ago 571st lukegustafson 🇺🇸 929 35 122ms 4 Aug 2024 571st JayXon 🇺🇸 929 35 133ms 4 Aug 2024 571st Lydxn 🇨🇦 929 35 124ms 6 Aug 2024 571st Steffan153 🇫🇮 929 35 125ms 6 Aug 2024 571st sean-niemann 🇺🇸 929 35 128ms 6 Feb 2025 576th NewDefectus 🇮🇱 928 22 33ms 10 Oct 2021 576th yzhs 🇩🇪 928 22 35ms 20 Jul 2022 576th saltysylvi 928 22 34ms 5 Aug 2022 576th ashtraypettingzoo 🇺🇸 928 22 33ms 22 Feb 2023 576th MeWhenI 🇻🇦 928 22 33ms 7 Aug 2023 576th Yewzir 🇧🇪 928 22 33ms 6 Nov 2023 576th Natanaelel 🇸🇪 928 22 35ms 28 Nov 2023 576th orthoplex 🇨🇽 928 22 33ms 20 Jul 2024 584th Lydxn 🇨🇦 928 37 3ms 29 Sep 2022 584th GrayJoKing 🇦🇺 928 37 3ms 29 Sep 2022 584th DialFrost 🇸🇬 928 37 3ms 24 Jan 2023 584th Steffan153 🇫🇮 928 37 3ms 3 Feb 2023 584th sisyphus-ppcg 🇦🇺 928 37 2ms 4 Feb 2023 584th prplz 🇦🇺 928 37 3ms 18 May 2023 584th ovs-code 🇩🇪 928 37 3ms 17 Jul 2023 584th sean-niemann 🇺🇸 928 37 3ms 23 Oct 2023 584th xsot 🇸🇬 928 37 2ms 8 Feb 2024 584th Yewzir 🇧🇪 928 37 2ms 2 Mar 2024 584th pardouin 🇫🇷 928 37 3ms 20 Aug 2024 584th edsrzf 🇳🇿 928 37 3ms 4 Sep 2025 596th inventshah 927 40 1ms 30 Oct 2022 596th Lydxn 🇨🇦 927 40 1ms 30 Oct 2022 596th GrayJoKing 🇦🇺 927 40 1ms 3 Nov 2022 596th sisyphus-ppcg 🇦🇺 927 40 2ms 3 Nov 2022 596th sean-niemann 🇺🇸 927 40 1ms 4 Nov 2022 596th btnlq 927 40 2ms 5 Nov 2022 596th MeWhenI 🇻🇦 927 40 1ms 5 Nov 2022 596th primo-ppcg 🇹🇭 927 40 1ms 6 Nov 2022 596th Steffan153 🇫🇮 927 40 1ms 26 Nov 2022 596th DialFrost 🇸🇬 927 40 2ms 12 Jan 2023 596th prplz 🇦🇺 927 40 1ms 12 Jan 2023 596th Shanethegamer 🇺🇸 927 40 1ms 6 Feb 2023 596th JayXon 🇺🇸 927 40 2ms 16 Mar 2023 596th xsot 🇸🇬 927 40 2ms 14 Jul 2023 596th Yewzir 🇧🇪 927 40 2ms 12 Oct 2023 596th Betuaredead 927 40 1ms 11 Nov 2023 596th pardouin 🇫🇷 927 40 2ms 17 Aug 2024 596th fuzzylojik-golf 🇺🇸 927 40 2ms 1 Jul 2025 596th edsrzf 🇳🇿 927 40 2ms 4 Sep 2025 596th snoozingnewt 🇨🇦 927 40 2ms 20 Oct 2025 596th KasperKivimaeki 🇫🇮 927 40 2ms 4 days ago 617th Steffan153 🇫🇮 926 40 116ms 11 Jan 2023 617th JayXon 🇺🇸 926 40 99ms 23 Dec 2024 619th inventshah 926 42 2ms 9 Sep 2022 619th Lydxn 🇨🇦 926 42 2ms 9 Sep 2022 619th JayXon 🇺🇸 926 42 2ms 10 Sep 2022 619th btnlq 926 42 2ms 10 Sep 2022 619th GrayJoKing 🇦🇺 926 42 2ms 11 Sep 2022 619th m-tkach 🇺🇦 926 42 2ms 25 Oct 2022 619th sean-niemann 🇺🇸 926 42 2ms 3 Nov 2022 619th MeWhenI 🇻🇦 926 42 2ms 5 Nov 2022 619th DialFrost 🇸🇬 926 42 2ms 12 Jan 2023 619th Steffan153 🇫🇮 926 42 2ms 12 Jan 2023 619th Shanethegamer 🇺🇸 926 42 2ms 6 Feb 2023 619th sisyphus-ppcg 🇦🇺 926 42 2ms 23 Mar 2023 619th prplz 🇦🇺 926 42 2ms 23 May 2023 619th ovs-code 🇩🇪 926 42 2ms 17 Jul 2023 619th Yewzir 🇧🇪 926 42 2ms 11 Oct 2023 619th Betuaredead 926 42 2ms 11 Nov 2023 619th dokutan 926 42 2ms 27 Mar 2024 619th pardouin 🇫🇷 926 42 2ms 20 Aug 2024 619th stefangimmillaro 926 42 2ms 30 Sep 2024 619th fuzzylojik-golf 🇺🇸 926 42 2ms 18 Jul 2025 619th edsrzf 🇳🇿 926 42 3ms 22 Jul 2025 619th snoozingnewt 🇨🇦 926 42 2ms 20 Oct 2025 First Prev 561–640 of 3,273 Next Last