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 319th primo-ppcg 🇹🇭 948 35 4ms 9 Feb 2021 319th prplz 🇦🇺 948 35 4ms 10 Feb 2021 319th Lydxn 🇨🇦 948 35 4ms 10 Feb 2021 319th o0lit3 🇺🇸 948 35 4ms 11 Feb 2021 319th sisyphus-ppcg 🇦🇺 948 35 6ms 5 Jun 2021 319th lynn 948 35 4ms 11 Sep 2021 319th stefangimmillaro 948 35 4ms 4 Nov 2022 319th MeWhenI 🇻🇦 948 35 5ms 6 Nov 2022 319th sean-niemann 🇺🇸 948 35 4ms 6 Nov 2022 319th emplv 🇱🇻 948 35 5ms 22 Nov 2022 319th Steffan153 🇫🇮 948 35 4ms 26 Nov 2022 319th DialFrost 🇸🇬 948 35 5ms 12 Jan 2023 319th Shanethegamer 🇺🇸 948 35 4ms 6 Feb 2023 319th rucin93 🇵🇱 948 35 4ms 4 Jul 2023 319th ovs-code 🇩🇪 948 35 4ms 4 Oct 2023 319th Yewzir 🇧🇪 948 35 4ms 11 Oct 2023 319th Betuaredead 948 35 4ms 11 Nov 2023 319th xsot 🇸🇬 948 35 4ms 7 Apr 2024 319th pardouin 🇫🇷 948 35 4ms 19 Aug 2024 319th fuzzylojik-golf 🇺🇸 948 35 4ms 1 Jul 2025 319th edsrzf 🇳🇿 948 35 4ms 4 Sep 2025 319th snoozingnewt 🇨🇦 948 35 4ms 20 Oct 2025 319th KasperKivimaeki 🇫🇮 948 35 5ms 8 days ago 344th JayXon 🇺🇸 944 33 459ms 25 Feb 2021 344th HPWiz 🇳🇿 944 33 421ms 27 Apr 2021 344th Lydxn 🇨🇦 944 33 461ms 16 Jun 2021 344th Steffan153 🇫🇮 944 33 417ms 30 Nov 2022 344th sisyphus-ppcg 🇦🇺 944 33 456ms 24 Jan 2023 344th ovs-code 🇩🇪 944 33 462ms 24 Oct 2023 344th DialFrost 🇸🇬 944 33 502ms 24 Oct 2023 344th sean-niemann 🇺🇸 944 33 463ms 24 Oct 2023 344th alemelis 944 33 407ms 4 Oct 2024 344th twolfive 944 33 414ms 5 Oct 2024 354th jared-hughes 940 35 9ms 28 Feb 2022 354th m-tkach 🇺🇦 940 35 8ms 24 Feb 2023 354th AutoGPT-code-golfer 940 35 9ms 23 Apr 2023 354th emgordon154 940 35 9ms 20 Mar 2025 358th GrayJoKing 🇦🇺 939 38 403ms 15 Jan 2024 358th ovs-code 🇩🇪 939 38 380ms 16 Jan 2024 358th Lydxn 🇨🇦 939 38 362ms 16 Jan 2024 358th Steffan153 🇫🇮 939 38 390ms 16 Jan 2024 358th inventshah 939 38 365ms 16 Jan 2024 358th kg583 🇺🇸 939 38 375ms 16 Jan 2024 358th JayXon 🇺🇸 939 38 372ms 16 Jan 2024 358th DialFrost 🇸🇬 939 38 394ms 16 Jan 2024 358th sisyphus-ppcg 🇦🇺 939 38 382ms 16 Jan 2024 358th sean-niemann 🇺🇸 939 38 379ms 17 Jan 2024 358th m-tkach 🇺🇦 939 38 374ms 21 Jan 2024 358th rucin93 🇵🇱 939 38 371ms 21 Jan 2024 358th orthoplex 🇨🇽 939 38 408ms 24 Jan 2024 358th Yewzir 🇧🇪 939 38 387ms 28 Jan 2024 358th xsot 🇸🇬 939 38 409ms 29 Jan 2024 358th lynn 939 38 380ms 17 Feb 2024 358th Shanethegamer 🇺🇸 939 38 352ms 24 Mar 2024 358th MeWhenI 🇻🇦 939 38 401ms 24 May 2024 358th pardouin 🇫🇷 939 38 394ms 21 Jun 2024 358th b-illy 🇬🇧 939 38 377ms 7 Sep 2024 358th CaedenHarper 🇨🇦 939 38 393ms 3 Oct 2024 358th emgordon154 939 38 449ms 18 Mar 2025 358th fuzzylojik-golf 🇺🇸 939 38 374ms 17 Jun 2025 358th duckyluuk 🇳🇱 939 38 418ms 25 Jul 2025 358th Babafaba 939 38 407ms 6 Nov 2025 383rd GrayJoKing 🇦🇺 939 41 1ms 9 Feb 2021 383rd primo-ppcg 🇹🇭 939 41 1ms 9 Feb 2021 383rd JayXon 🇺🇸 939 41 1ms 9 Feb 2021 383rd prplz 🇦🇺 939 41 1ms 10 Feb 2021 383rd sisyphus-ppcg 🇦🇺 939 41 1ms 10 Feb 2021 383rd Waffle3z 939 41 1ms 10 Feb 2021 383rd Lydxn 🇨🇦 939 41 1ms 10 Feb 2021 383rd orthoplex 🇨🇽 939 41 1ms 12 Aug 2021 383rd lynn 939 41 1ms 11 Sep 2021 383rd jared-hughes 939 41 1ms 28 Feb 2022 383rd m-tkach 🇺🇦 939 41 2ms 24 Oct 2022 383rd MeWhenI 🇻🇦 939 41 2ms 5 Nov 2022 383rd Steffan153 🇫🇮 939 41 1ms 26 Nov 2022 383rd DialFrost 🇸🇬 939 41 1ms 12 Jan 2023 383rd sean-niemann 🇺🇸 939 41 1ms 12 Jan 2023 383rd Shanethegamer 🇺🇸 939 41 1ms 6 Feb 2023 383rd xsot 🇸🇬 939 41 1ms 9 Oct 2023 383rd Betuaredead 939 41 1ms 12 Nov 2023 First Prev 321–400 of 3,296 Next Last