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 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 797th lynn 920 46 13ms 30 Mar 2022 797th primo-ppcg 🇹🇭 920 46 12ms 2 Jun 2022 797th Steffan153 🇫🇮 920 46 12ms 24 Nov 2022 797th annaproxy 920 46 12ms 8 Jan 2023 797th Yewzir 🇧🇪 920 46 13ms 23 Feb 2024 797th ovs-code 🇩🇪 920 46 13ms 1 Jul 2024 797th DialFrost 🇸🇬 920 46 13ms 24 Mar 2025 797th sean-niemann 🇺🇸 920 46 13ms 25 Mar 2025 797th snoozingnewt 🇨🇦 920 46 13ms 11 days ago 810th GrayJoKing 🇦🇺 919 48 76ms 6 Jun 2022 810th Lydxn 🇨🇦 919 48 76ms 6 Jun 2022 810th JayXon 🇺🇸 919 48 70ms 20 Mar 2023 810th Steffan153 🇫🇮 919 48 75ms 21 Mar 2023 810th Yewzir 🇧🇪 919 48 74ms 5 Mar 2024 810th jipsong 🇩🇪 919 48 67ms 10 Jun 2024 810th pardouin 🇫🇷 919 48 68ms 3 Sep 2024 810th sean-niemann 🇺🇸 919 48 67ms 18 Apr 2025 818th pardouin 🇫🇷 918 42 3,715ms 23 Oct 2024 818th inventshah 918 42 4,469ms 24 Oct 2024 818th DialFrost 🇸🇬 918 42 3,642ms 24 Oct 2024 818th stefangimmillaro 918 42 4,633ms 24 Oct 2024 818th btnlq 918 42 3,889ms 25 Oct 2024 818th JayXon 🇺🇸 918 42 3,857ms 27 Oct 2024 818th sean-niemann 🇺🇸 918 42 4,068ms 29 Oct 2024 818th emgordon154 918 42 4,495ms 20 Mar 2025 818th snoozingnewt 🇨🇦 918 42 4,166ms 20 Oct 2025 827th rucin93 🇵🇱 918 61 419ms 24 Sep 2025 827th Shanethegamer 🇺🇸 918 61 416ms 25 Sep 2025 827th FlyingPenguin223 918 61 435ms 25 Sep 2025 827th emgordon154 918 61 394ms 25 Sep 2025 827th voytxt 🇨🇿 918 61 432ms 25 Sep 2025 827th MeWhenI 🇻🇦 918 61 439ms 7 Nov 2025 827th dokutan 918 61 376ms 17 days ago 834th jared-hughes 918 68 52ms 20 Jul 2022 834th m-tkach 🇺🇦 918 68 52ms 15 Aug 2022 834th 09cf 918 68 64ms 24 days ago 837th GrayJoKing 🇦🇺 916 34 333ms 19 Nov 2022 837th Betuaredead 916 34 397ms 14 Nov 2023 837th Yewzir 🇧🇪 916 34 412ms 14 Nov 2023 837th Shanethegamer 🇺🇸 916 34 412ms 10 Dec 2023 837th pardouin 🇫🇷 916 34 405ms 14 Sep 2024 842nd Steffan153 🇫🇮 916 52 154ms 7 Aug 2024 843rd SirBogman 🇺🇸 915 39 347ms 15 Jan 2024 843rd AlephSquirrel 915 39 372ms 16 Jan 2024 843rd namelessiw 915 39 366ms 23 Jan 2024 843rd dokutan 915 39 374ms 26 Mar 2024 843rd alemelis 915 39 411ms 4 Oct 2024 843rd CornerMercury 🇬🇧 915 39 339ms 12 Oct 2025 843rd snoozingnewt 🇨🇦 915 39 318ms 20 Oct 2025 843rd GolfingSuccess 🇬🇷 915 39 372ms 20 days ago 843rd BREMAUCY 🇫🇷 915 39 341ms 13 days ago 852nd Lydxn 🇨🇦 915 49 35ms 13 Jun 2022 852nd primo-ppcg 🇹🇭 915 49 36ms 13 Jun 2022 852nd GrayJoKing 🇦🇺 915 49 37ms 22 Jun 2022 852nd JayXon 🇺🇸 915 49 35ms 9 Sep 2022 852nd MeWhenI 🇻🇦 915 49 34ms 5 Nov 2022 852nd Steffan153 🇫🇮 915 49 37ms 27 Nov 2022 852nd DialFrost 🇸🇬 915 49 36ms 13 Jan 2023 852nd sean-niemann 🇺🇸 915 49 37ms 21 Apr 2023 852nd prplz 🇦🇺 915 49 34ms 22 May 2023 852nd Yewzir 🇧🇪 915 49 35ms 12 Oct 2023 852nd Betuaredead 915 49 34ms 11 Nov 2023 852nd pardouin 🇫🇷 915 49 36ms 5 Oct 2024 852nd fuzzylojik-golf 🇺🇸 915 49 37ms 6 Sep 2025 852nd CaedenHarper 🇨🇦 915 49 38ms 27 Oct 2025 866th kkoenig 915 50 1ms 4 Jan 2024 866th namelessiw 915 50 1ms 11 Mar 2024 866th dokutan 915 50 1ms 27 Apr 2024 866th FlyingPenguin223 915 50 1ms 18 Dec 2024 866th Yax42 🇫🇷 915 50 2ms 3 Oct 2025 866th Babafaba 915 50 1ms 18 Oct 2025 866th ApoChagi 915 50 1ms 19 Oct 2025 873rd UnderKoen 🇳🇱 915 58 1ms 6 Jul 2022 873rd sisyphus-ppcg 🇦🇺 915 58 1ms 7 Jul 2022 873rd m-tkach 🇺🇦 915 58 1ms 8 Mar 2023 873rd orthoplex 🇨🇽 915 58 1ms 29 Jun 2023 873rd Lydxn 🇨🇦 915 58 1ms 19 Jul 2023 878th Natanaelel 🇸🇪 914 36 8ms 25 Jun 2022 878th scpchicken 🇵🇼 914 36 9ms 25 Feb 2023 878th Yax42 🇫🇷 914 36 9ms 5 Sep 2025 First Prev 801–880 of 3,299 Next Last