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 880th MeWhenI 🇻🇦 904 36 119ms 3 Aug 2024 880th rucin93 🇵🇱 904 36 123ms 6 Aug 2024 880th sisyphus-ppcg 🇦🇺 904 36 118ms 8 Aug 2024 880th GrayJoKing 🇦🇺 904 36 125ms 13 Aug 2024 880th pardouin 🇫🇷 904 36 118ms 3 Sep 2024 880th emplv 🇱🇻 904 36 123ms 29 Oct 2024 880th fuzzylojik-golf 🇺🇸 904 36 128ms 2 Aug 2025 880th Yewzir 🇧🇪 904 36 124ms 18 Nov 2025 889th MeWhenI 🇻🇦 904 38 2ms 5 Nov 2022 889th snoozingnewt 🇨🇦 904 38 3ms 22 Oct 2025 891st Yewzir 🇧🇪 904 41 94ms 22 Dec 2024 891st dokutan 904 41 96ms 22 Dec 2024 891st DialFrost 🇸🇬 904 41 96ms 22 Dec 2024 891st rucin93 🇵🇱 904 41 94ms 22 Dec 2024 891st Shanethegamer 🇺🇸 904 41 90ms 22 Dec 2024 891st pardouin 🇫🇷 904 41 97ms 22 Dec 2024 891st MeWhenI 🇻🇦 904 41 96ms 23 Dec 2024 891st sean-niemann 🇺🇸 904 41 98ms 23 Dec 2024 891st inventshah 904 41 94ms 23 Dec 2024 891st ovs-code 🇩🇪 904 41 96ms 24 Dec 2024 891st primo-ppcg 🇹🇭 904 41 94ms 6 Jan 2025 891st sisyphus-ppcg 🇦🇺 904 41 93ms 6 Jan 2025 891st prplz 🇦🇺 904 41 89ms 7 Jan 2025 891st GrayJoKing 🇦🇺 904 41 96ms 21 Mar 2025 891st edsrzf 🇳🇿 904 41 108ms 22 Jul 2025 891st fuzzylojik-golf 🇺🇸 904 41 96ms 29 Aug 2025 891st snoozingnewt 🇨🇦 904 41 92ms 20 Oct 2025 908th inventshah 903 48 99ms 20 Oct 2022 908th MeWhenI 🇻🇦 903 48 101ms 5 Nov 2022 908th Alex-x90 🇺🇸 903 48 96ms 24 Feb 2023 911th btnlq 903 80 1ms 11 Jun 2023 911th saito-ta 🇯🇵 903 80 1ms 11 Jun 2023 913th Waffle3z 902 30 35ms 10 Feb 2021 913th lynn 902 30 33ms 11 Sep 2021 913th Irratix 🇳🇱 902 30 36ms 22 Mar 2022 913th orthoplex 🇨🇽 902 30 35ms 30 Mar 2022 913th SirBogman 🇺🇸 902 30 41ms 31 May 2022 913th inventshah 902 30 32ms 18 Jun 2022 913th jared-hughes 902 30 32ms 10 Sep 2022 913th Shanethegamer 🇺🇸 902 30 35ms 6 Feb 2023 913th ovs-code 🇩🇪 902 30 38ms 17 Jul 2023 913th Betuaredead 902 30 37ms 11 Nov 2023 913th dokutan 902 30 43ms 26 Mar 2024 913th BREMAUCY 🇫🇷 902 30 45ms 14 May 2024 913th FlyingPenguin223 902 30 44ms 23 Oct 2024 913th emgordon154 902 30 45ms 18 Mar 2025 913th edsrzf 🇳🇿 902 30 42ms 26 Jul 2025 913th CaedenHarper 🇨🇦 902 30 35ms 13 Sep 2025 913th blaztoma 🇱🇹 902 30 37ms 3 days ago 930th Yax42 🇫🇷 902 57 124ms 4 Oct 2025 931st inventshah 901 39 75ms 12 Dec 2022 931st sisyphus-ppcg 🇦🇺 901 39 72ms 13 Dec 2022 931st Shanethegamer 🇺🇸 901 39 71ms 13 Apr 2023 931st Alessandro-Balconi 🇮🇹 901 39 75ms 25 Jul 2023 931st snoozingnewt 🇨🇦 901 39 65ms 24 days ago 936th kg583 🇺🇸 901 56 38ms 13 Feb 2025 937th m-tkach 🇺🇦 901 84 269ms 25 Oct 2022 938th sean-niemann 🇺🇸 899 53 113ms 4 Sep 2024 939th emgordon154 898 61 507ms 28 May 2025 940th lifthrasiir 🇰🇷 897 68 7ms 19 Dec 2024 940th jared-hughes 897 68 11ms 20 Dec 2024 942nd frankgraziano 897 137 10ms 11 Aug 2025 942nd primo-ppcg 🇹🇭 897 137 11ms 13 Aug 2025 942nd DialFrost 🇸🇬 897 137 10ms 13 Aug 2025 945th MeWhenI 🇻🇦 896 33 647ms 24 Nov 2025 946th rucin93 🇵🇱 896 43 3,386ms 23 Oct 2024 946th dokutan 896 43 3,168ms 23 Oct 2024 946th MeWhenI 🇻🇦 896 43 3,825ms 24 Oct 2024 946th Shanethegamer 🇺🇸 896 43 3,928ms 24 Oct 2024 946th Yewzir 🇧🇪 896 43 3,590ms 24 Oct 2024 946th voytxt 🇨🇿 896 43 3,687ms 19 Jan 2025 946th edsrzf 🇳🇿 896 43 4,248ms 22 Jul 2025 946th Yax42 🇫🇷 896 43 3,887ms 4 Oct 2025 954th namelessiw 896 50 1ms 28 Dec 2023 954th Babafaba 896 50 1ms 18 Oct 2025 954th ApoChagi 896 50 1ms 19 Oct 2025 957th Lydxn 🇨🇦 895 50 40ms 11 Oct 2021 958th inventshah 892 38 365ms 15 Jan 2024 958th GrayJoKing 🇦🇺 892 38 403ms 15 Jan 2024 958th rucin93 🇵🇱 892 38 371ms 21 Jan 2024 First Prev 881–960 of 3,268 Next Last