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 38th rucin93 🇵🇱 978 40 9ms 12 Jan 2024 38th dokutan 978 40 10ms 30 Apr 2024 38th BREMAUCY 🇫🇷 978 40 9ms 14 May 2024 38th CaedenHarper 🇨🇦 978 40 9ms 18 Jul 2024 38th b-illy 🇬🇧 978 40 16ms 18 Jul 2024 38th zach333 978 40 9ms 18 Jul 2024 38th khvdm 978 40 9ms 2 Aug 2024 38th lukegustafson 🇺🇸 978 40 16ms 28 Sep 2024 38th FlyingPenguin223 978 40 9ms 1 Nov 2024 38th CLOStrophobic 🇮🇹 978 40 9ms 19 Jan 2025 38th emgordon154 978 40 9ms 18 Mar 2025 38th Mukundan314 978 40 9ms 26 Apr 2025 38th fuzzylojik-golf 🇺🇸 978 40 9ms 29 May 2025 38th KasperKivimaeki 🇫🇮 978 40 15ms 30 Jun 2025 38th 4atj 978 40 9ms 30 Jun 2025 38th edsrzf 🇳🇿 978 40 9ms 22 Jul 2025 38th duckyluuk 🇳🇱 978 40 16ms 25 Jul 2025 38th CornerMercury 🇬🇧 978 40 9ms 12 Oct 2025 38th ndren 978 40 9ms 12 Oct 2025 38th Babafaba 978 40 10ms 18 Oct 2025 38th ApoChagi 978 40 10ms 18 Oct 2025 38th snoozingnewt 🇨🇦 978 40 16ms 20 Oct 2025 38th 09cf 978 40 17ms 23 days ago 38th sunleonid 978 40 10ms 22 days ago 38th AdrienHache 🇫🇷 978 40 10ms 22 hours ago 38th blaztoma 🇱🇹 978 40 11ms 4 mins ago 107th Frowny 972 21 34ms 12 Aug 2018 107th miles-cg 972 21 34ms 25 Aug 2018 107th primo-ppcg 🇹🇭 972 21 34ms 6 Sep 2018 107th HPWiz 🇳🇿 972 21 33ms 13 Sep 2018 107th diddily 972 21 33ms 30 Oct 2019 107th SirBogman 🇺🇸 972 21 34ms 1 Nov 2019 107th prplz 🇦🇺 972 21 33ms 3 Jan 2020 107th nwellnhof 🇩🇪 972 21 34ms 5 May 2020 107th StellaCG 972 21 35ms 8 Jul 2020 107th GrayJoKing 🇦🇺 972 21 33ms 14 Oct 2020 107th lynn 972 21 34ms 12 Apr 2021 107th kurkale6ka 972 21 33ms 25 Aug 2021 107th Lydxn 🇨🇦 972 21 33ms 27 Sep 2021 107th Bubbler-4 972 21 34ms 18 Nov 2021 107th ovs-code 🇩🇪 972 21 34ms 26 Jan 2022 107th 4hg 🇺🇸 972 21 35ms 19 Jul 2022 107th Steffan153 🇫🇮 972 21 34ms 12 Jan 2023 107th scpchicken 🇵🇼 972 21 36ms 23 Jan 2023 107th DialFrost 🇸🇬 972 21 33ms 24 Jan 2023 107th sean-niemann 🇺🇸 972 21 34ms 26 Jan 2023 107th neel11235813 972 21 33ms 24 Feb 2023 107th stackofbears 972 21 36ms 28 Nov 2023 107th pardouin 🇫🇷 972 21 35ms 24 Sep 2024 107th JayXon 🇺🇸 972 21 32ms 8 Mar 2025 107th 2bular 972 21 35ms 1 Apr 2025 107th fuzzylojik-golf 🇺🇸 972 21 33ms 27 Aug 2025 133rd btnlq 972 22 249ms 9 Feb 2021 133rd JayXon 🇺🇸 972 22 226ms 9 Feb 2021 133rd primo-ppcg 🇹🇭 972 22 253ms 9 Feb 2021 133rd prplz 🇦🇺 972 22 237ms 10 Feb 2021 133rd sisyphus-ppcg 🇦🇺 972 22 242ms 8 Jun 2021 133rd Lydxn 🇨🇦 972 22 253ms 9 Jun 2021 133rd orthoplex 🇨🇽 972 22 247ms 12 Aug 2021 133rd lynn 972 22 239ms 11 Sep 2021 133rd GrayJoKing 🇦🇺 972 22 252ms 19 Oct 2021 133rd SirBogman 🇺🇸 972 22 240ms 31 May 2022 133rd inventshah 972 22 231ms 18 Jun 2022 133rd stefangimmillaro 972 22 228ms 4 Nov 2022 133rd MeWhenI 🇻🇦 972 22 252ms 5 Nov 2022 133rd Steffan153 🇫🇮 972 22 240ms 1 Jan 2023 133rd DialFrost 🇸🇬 972 22 261ms 12 Jan 2023 133rd sean-niemann 🇺🇸 972 22 236ms 22 Jan 2023 133rd Shanethegamer 🇺🇸 972 22 248ms 6 Feb 2023 133rd ovs-code 🇩🇪 972 22 269ms 17 Jul 2023 133rd Yewzir 🇧🇪 972 22 278ms 19 Nov 2023 133rd bitsandbeyond 🇳🇱 972 22 226ms 8 Jun 2024 133rd pardouin 🇫🇷 972 22 235ms 19 Aug 2024 133rd fuzzylojik-golf 🇺🇸 972 22 190ms 27 Aug 2025 133rd snoozingnewt 🇨🇦 972 22 215ms 20 Oct 2025 156th GrayJoKing 🇦🇺 967 34 9ms 9 Feb 2021 156th JayXon 🇺🇸 967 34 9ms 9 Feb 2021 156th primo-ppcg 🇹🇭 967 34 9ms 9 Feb 2021 156th prplz 🇦🇺 967 34 9ms 10 Feb 2021 156th sisyphus-ppcg 🇦🇺 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