The Calendar hole will go live in approximately 12 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 401st primo-ppcg 🇹🇭 884 47 446ms 20 Nov 2022 402nd canissimia 🇦🇶 884 165 9ms 18 Nov 2023 403rd sisyphus-ppcg 🇦🇺 883 79 403ms 23 days ago 404th GrayJoKing 🇦🇺 881 58 5ms 26 Oct 2023 405th Lydxn 🇨🇦 879 54 35ms 20 Jul 2023 405th DialFrost 🇸🇬 879 54 5ms 5 mins ago 407th codewrite 🇬🇧 879 73 375ms 11 Jul 2025 408th Steffan153 🇫🇮 878 62 23ms 11 Dec 2023 408th Yewzir 🇧🇪 878 62 29ms 17 Dec 2023 408th dokutan 878 62 22ms 9 May 2024 408th edsrzf 🇳🇿 878 62 25ms 5 Jan 2025 408th kg583 🇺🇸 878 62 24ms 31 Jul 2025 408th sean-niemann 🇺🇸 878 62 24ms 17 Aug 2025 414th GrayJoKing 🇦🇺 878 65 130ms 26 Oct 2023 415th snoozingnewt 🇨🇦 878 78 124ms 9 Oct 2025 416th canissimia 🇦🇶 878 113 553ms 13 Dec 2022 417th Shanethegamer 🇺🇸 877 54 360ms 16 Jan 2024 418th snoozingnewt 🇨🇦 877 60 100ms 9 Oct 2025 419th JayXon 🇺🇸 877 130 1,668ms 15 Sep 2025 420th anter69 🇭🇺 876 47 54ms 24 Jan 2023 420th emgordon154 876 47 49ms 19 Mar 2025 420th Lv0Sys 🇵🇱 876 47 55ms 11 days ago 423rd annaproxy 876 57 17ms 8 Jan 2023 424th DialFrost 🇸🇬 874 144 564ms 28 Mar 2025 424th pardouin 🇫🇷 874 144 462ms 23 Apr 2025 426th jared-hughes 874 160 48ms 21 Jul 2023 427th primo-ppcg 🇹🇭 873 55 37ms 20 Nov 2022 428th za3k 873 58 18ms 20 Nov 2022 428th Alex-x90 🇺🇸 873 58 16ms 3 Dec 2022 428th 2011-Chan-Ethan 873 58 16ms 9 Jul 2023 428th MeWhenI 🇻🇦 873 58 17ms 10 Oct 2023 428th marcin7Cd 873 58 16ms 28 Apr 2025 428th jipsong 🇩🇪 873 58 23ms 20 Jun 2025 434th stefangimmillaro 872 57 41ms 20 Nov 2022 434th marshallward 🇺🇸 872 57 42ms 21 Nov 2022 434th Steffan153 🇫🇮 872 57 43ms 30 Jan 2023 434th DialFrost 🇸🇬 872 57 42ms 22 Oct 2024 438th kmathis22 872 80 446ms 28 Oct 2025 438th dokutan 872 80 409ms 16 days ago 440th DialFrost 🇸🇬 872 95 394ms 16 days ago 441st pardouin 🇫🇷 868 70 1,261ms 23 Apr 2025 442nd emgordon154 868 145 453ms 19 Mar 2025 443rd ovs-code 🇩🇪 868 161 49ms 23 May 2025 444th fuzzylojik-golf 🇺🇸 867 74 415ms 30 Aug 2025 445th sean-niemann 🇺🇸 867 80 420ms 7 Feb 2023 445th Steffan153 🇫🇮 867 80 427ms 17 Feb 2023 445th DialFrost 🇸🇬 867 80 431ms 3 Jun 2024 445th ovs-code 🇩🇪 867 80 427ms 23 Jul 2024 445th fuzzylojik-golf 🇺🇸 867 80 507ms 20 Aug 2025 450th MeWhenI 🇻🇦 865 91 222ms 9 Apr 2024 451st primo-ppcg 🇹🇭 865 192 37ms 13 Aug 2025 452nd Steffan153 🇫🇮 864 79 24ms 21 Feb 2023 452nd Lydxn 🇨🇦 864 79 25ms 22 Feb 2023 452nd m-tkach 🇺🇦 864 79 24ms 15 Mar 2023 452nd sean-niemann 🇺🇸 864 79 25ms 14 Jan 2025 456th Shanethegamer 🇺🇸 863 39 915ms 21 Nov 2022 456th snoozingnewt 🇨🇦 863 39 781ms 23 Oct 2025 458th inventshah 862 85 81ms 29 Nov 2022 458th xsot 🇸🇬 862 85 60ms 28 Apr 2024 460th saito-ta 🇯🇵 861 41 11ms 24 Dec 2024 461st MeWhenI 🇻🇦 861 55 414ms 24 May 2024 461st snoozingnewt 🇨🇦 861 55 321ms 17 Oct 2025 463rd Liibe 861 81 440ms 25 Sep 2025 463rd Yax42 🇫🇷 861 81 447ms 6 Oct 2025 463rd MeWhenI 🇻🇦 861 81 547ms 7 Nov 2025 466th stefangimmillaro 858 30 348ms 20 Nov 2022 467th snoozingnewt 🇨🇦 858 48 59ms 23 Oct 2025 468th AlexanderFair 858 59 23ms 18 Jul 2023 468th Grrisly 858 59 16ms 30 Mar 2024 468th dokutan 858 59 17ms 9 Jun 2024 468th albanian-laundromat 858 59 16ms 21 Aug 2025 472nd lynn 858 72 246ms 27 Jan 2023 473rd rak1507 🇬🇧 857 28 39ms 27 Jan 2023 473rd lifthrasiir 🇰🇷 857 28 3ms 27 Nov 2024 475th ovs-code 🇩🇪 857 133 1,696ms 14 Sep 2025 475th emgordon154 857 133 1,931ms 9 hours ago 477th Steffan153 🇫🇮 856 52 63ms 12 Aug 2024 477th ovs-code 🇩🇪 856 52 55ms 10 Oct 2024 479th edsrzf 🇳🇿 856 73 47ms 9 Sep 2025 480th emplv 🇱🇻 853 80 24ms 30 Nov 2022 First Prev 401–480 of 1,816 Next Last