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 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 794th annaproxy 920 46 12ms 8 Jan 2023 794th Yewzir 🇧🇪 920 46 13ms 23 Feb 2024 794th ovs-code 🇩🇪 920 46 13ms 1 Jul 2024 794th DialFrost 🇸🇬 920 46 13ms 24 Mar 2025 794th sean-niemann 🇺🇸 920 46 13ms 25 Mar 2025 794th snoozingnewt 🇨🇦 920 46 13ms 10 days ago 807th GrayJoKing 🇦🇺 919 48 76ms 6 Jun 2022 807th Lydxn 🇨🇦 919 48 76ms 6 Jun 2022 807th JayXon 🇺🇸 919 48 70ms 20 Mar 2023 807th Steffan153 🇫🇮 919 48 75ms 21 Mar 2023 807th Yewzir 🇧🇪 919 48 74ms 5 Mar 2024 807th jipsong 🇩🇪 919 48 67ms 10 Jun 2024 807th pardouin 🇫🇷 919 48 68ms 3 Sep 2024 807th sean-niemann 🇺🇸 919 48 67ms 18 Apr 2025 815th pardouin 🇫🇷 918 42 3,715ms 23 Oct 2024 815th inventshah 918 42 4,469ms 24 Oct 2024 815th DialFrost 🇸🇬 918 42 3,642ms 24 Oct 2024 815th stefangimmillaro 918 42 4,633ms 24 Oct 2024 815th btnlq 918 42 3,889ms 25 Oct 2024 815th JayXon 🇺🇸 918 42 3,857ms 27 Oct 2024 815th sean-niemann 🇺🇸 918 42 4,068ms 29 Oct 2024 815th emgordon154 918 42 4,495ms 20 Mar 2025 815th snoozingnewt 🇨🇦 918 42 4,166ms 20 Oct 2025 824th rucin93 🇵🇱 918 61 419ms 24 Sep 2025 824th Shanethegamer 🇺🇸 918 61 416ms 25 Sep 2025 824th FlyingPenguin223 918 61 435ms 25 Sep 2025 824th emgordon154 918 61 394ms 25 Sep 2025 824th voytxt 🇨🇿 918 61 432ms 25 Sep 2025 824th MeWhenI 🇻🇦 918 61 439ms 7 Nov 2025 824th dokutan 918 61 376ms 16 days ago 831st jared-hughes 918 68 52ms 20 Jul 2022 831st m-tkach 🇺🇦 918 68 52ms 15 Aug 2022 831st 09cf 918 68 64ms 22 days ago 834th GrayJoKing 🇦🇺 916 34 333ms 19 Nov 2022 834th Betuaredead 916 34 397ms 14 Nov 2023 834th Yewzir 🇧🇪 916 34 412ms 14 Nov 2023 834th Shanethegamer 🇺🇸 916 34 412ms 10 Dec 2023 834th pardouin 🇫🇷 916 34 405ms 14 Sep 2024 839th Steffan153 🇫🇮 916 52 154ms 7 Aug 2024 840th SirBogman 🇺🇸 915 39 347ms 15 Jan 2024 840th AlephSquirrel 915 39 372ms 16 Jan 2024 840th namelessiw 915 39 366ms 23 Jan 2024 840th dokutan 915 39 374ms 26 Mar 2024 840th alemelis 915 39 411ms 4 Oct 2024 840th CornerMercury 🇬🇧 915 39 339ms 12 Oct 2025 840th snoozingnewt 🇨🇦 915 39 318ms 20 Oct 2025 840th GolfingSuccess 🇬🇷 915 39 372ms 19 days ago 840th BREMAUCY 🇫🇷 915 39 341ms 11 days ago 849th Lydxn 🇨🇦 915 49 35ms 13 Jun 2022 849th primo-ppcg 🇹🇭 915 49 36ms 13 Jun 2022 849th GrayJoKing 🇦🇺 915 49 37ms 22 Jun 2022 849th JayXon 🇺🇸 915 49 35ms 9 Sep 2022 849th MeWhenI 🇻🇦 915 49 34ms 5 Nov 2022 849th Steffan153 🇫🇮 915 49 37ms 27 Nov 2022 849th DialFrost 🇸🇬 915 49 36ms 13 Jan 2023 849th sean-niemann 🇺🇸 915 49 37ms 21 Apr 2023 849th prplz 🇦🇺 915 49 34ms 22 May 2023 849th Yewzir 🇧🇪 915 49 35ms 12 Oct 2023 849th Betuaredead 915 49 34ms 11 Nov 2023 849th pardouin 🇫🇷 915 49 36ms 5 Oct 2024 849th fuzzylojik-golf 🇺🇸 915 49 37ms 6 Sep 2025 849th CaedenHarper 🇨🇦 915 49 38ms 27 Oct 2025 863rd kkoenig 915 50 1ms 4 Jan 2024 863rd namelessiw 915 50 1ms 11 Mar 2024 863rd dokutan 915 50 1ms 27 Apr 2024 863rd FlyingPenguin223 915 50 1ms 18 Dec 2024 863rd Yax42 🇫🇷 915 50 2ms 3 Oct 2025 863rd Babafaba 915 50 1ms 18 Oct 2025 863rd ApoChagi 915 50 1ms 19 Oct 2025 870th UnderKoen 🇳🇱 915 58 1ms 6 Jul 2022 870th sisyphus-ppcg 🇦🇺 915 58 1ms 7 Jul 2022 870th m-tkach 🇺🇦 915 58 1ms 8 Mar 2023 870th orthoplex 🇨🇽 915 58 1ms 29 Jun 2023 870th Lydxn 🇨🇦 915 58 1ms 19 Jul 2023 875th Natanaelel 🇸🇪 914 36 8ms 25 Jun 2022 875th scpchicken 🇵🇼 914 36 9ms 25 Feb 2023 875th Yax42 🇫🇷 914 36 9ms 5 Sep 2025 878th Steffan153 🇫🇮 914 40 3ms 12 Aug 2024 878th btnlq 914 40 3ms 18 Aug 2024 878th sean-niemann 🇺🇸 914 40 4ms 11 Oct 2024 First Prev 801–880 of 3,296 Next Last