The Calendar hole will go live in approximately 8 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 387th annaproxy 938 55 312ms 8 Jan 2023 387th DialFrost 🇸🇬 938 55 319ms 12 Jan 2023 387th Shanethegamer 🇺🇸 938 55 322ms 6 Feb 2023 387th btnlq 938 55 314ms 10 Mar 2023 387th namelessiw 938 55 392ms 22 Jul 2023 387th Yewzir 🇧🇪 938 55 321ms 11 Oct 2023 387th AdrienHache 🇫🇷 938 55 313ms 21 Oct 2023 387th Betuaredead 938 55 317ms 11 Nov 2023 387th pardouin 🇫🇷 938 55 364ms 18 Aug 2024 387th voytxt 🇨🇿 938 55 310ms 19 Jan 2025 387th b-illy 🇬🇧 938 55 324ms 21 Jan 2025 387th fuzzylojik-golf 🇺🇸 938 55 368ms 29 May 2025 387th Yax42 🇫🇷 938 55 364ms 31 May 2025 387th edsrzf 🇳🇿 938 55 352ms 22 Jul 2025 387th CaedenHarper 🇨🇦 938 55 376ms 4 Sep 2025 387th snoozingnewt 🇨🇦 938 55 377ms 20 Oct 2025 417th GrayJoKing 🇦🇺 937 33 4ms 20 May 2021 417th primo-ppcg 🇹🇭 937 33 3ms 20 May 2021 417th Lydxn 🇨🇦 937 33 5ms 29 May 2022 420th AdrienHache 🇫🇷 936 32 52ms 31 Oct 2024 421st JayXon 🇺🇸 936 38 86ms 27 Sep 2021 421st Lydxn 🇨🇦 936 38 89ms 27 Sep 2021 421st stefangimmillaro 936 38 83ms 4 Nov 2022 421st MeWhenI 🇻🇦 936 38 86ms 5 Nov 2022 421st Shanethegamer 🇺🇸 936 38 86ms 6 Feb 2023 421st DialFrost 🇸🇬 936 38 89ms 6 Feb 2023 421st Steffan153 🇫🇮 936 38 84ms 7 Feb 2023 421st sean-niemann 🇺🇸 936 38 86ms 7 Feb 2023 421st ovs-code 🇩🇪 936 38 83ms 17 Jul 2023 421st Yewzir 🇧🇪 936 38 84ms 11 Oct 2023 421st Betuaredead 936 38 86ms 11 Nov 2023 421st dokutan 936 38 86ms 28 Jul 2024 421st pardouin 🇫🇷 936 38 85ms 20 Aug 2024 421st primo-ppcg 🇹🇭 936 38 84ms 12 Apr 2025 421st edsrzf 🇳🇿 936 38 85ms 22 Jul 2025 421st fuzzylojik-golf 🇺🇸 936 38 89ms 7 Aug 2025 421st snoozingnewt 🇨🇦 936 38 86ms 20 Oct 2025 438th GrayJoKing 🇦🇺 936 41 2ms 9 Feb 2021 438th primo-ppcg 🇹🇭 936 41 2ms 9 Feb 2021 438th JayXon 🇺🇸 936 41 2ms 9 Feb 2021 438th prplz 🇦🇺 936 41 2ms 10 Feb 2021 438th sisyphus-ppcg 🇦🇺 936 41 1ms 10 Feb 2021 438th Waffle3z 936 41 2ms 10 Feb 2021 438th orthoplex 🇨🇽 936 41 1ms 12 Aug 2021 438th jared-hughes 936 41 2ms 28 Feb 2022 438th m-tkach 🇺🇦 936 41 2ms 24 Oct 2022 438th MeWhenI 🇻🇦 936 41 2ms 5 Nov 2022 438th DialFrost 🇸🇬 936 41 2ms 12 Jan 2023 438th sean-niemann 🇺🇸 936 41 2ms 12 Jan 2023 438th Shanethegamer 🇺🇸 936 41 2ms 6 Feb 2023 438th xsot 🇸🇬 936 41 2ms 9 Oct 2023 438th dokutan 936 41 2ms 26 Mar 2024 438th pardouin 🇫🇷 936 41 2ms 21 Sep 2024 438th FlyingPenguin223 936 41 2ms 23 Oct 2024 438th fuzzylojik-golf 🇺🇸 936 41 2ms 3 Jul 2025 438th edsrzf 🇳🇿 936 41 2ms 22 Jul 2025 438th snoozingnewt 🇨🇦 936 41 2ms 20 days ago 458th prplz 🇦🇺 935 55 118ms 13 Jan 2022 458th GrayJoKing 🇦🇺 935 55 118ms 13 Jan 2022 458th JayXon 🇺🇸 935 55 122ms 13 Jan 2022 458th Lydxn 🇨🇦 935 55 121ms 13 Jan 2022 458th primo-ppcg 🇹🇭 935 55 126ms 14 Jan 2022 458th lynn 935 55 119ms 10 Mar 2022 458th inventshah 935 55 120ms 15 Jun 2022 458th sisyphus-ppcg 🇦🇺 935 55 126ms 8 Aug 2022 458th sean-niemann 🇺🇸 935 55 122ms 3 Nov 2022 458th stefangimmillaro 935 55 131ms 4 Nov 2022 458th andersk 🇺🇸 935 55 118ms 5 Nov 2022 458th MeWhenI 🇻🇦 935 55 118ms 6 Nov 2022 458th Steffan153 🇫🇮 935 55 123ms 27 Nov 2022 458th DialFrost 🇸🇬 935 55 118ms 12 Jan 2023 458th rucin93 🇵🇱 935 55 115ms 19 Jan 2023 458th Shanethegamer 🇺🇸 935 55 116ms 6 Feb 2023 458th ovs-code 🇩🇪 935 55 133ms 17 Jul 2023 458th Yewzir 🇧🇪 935 55 120ms 11 Oct 2023 458th Betuaredead 935 55 114ms 11 Nov 2023 458th dokutan 935 55 120ms 27 Mar 2024 458th pardouin 🇫🇷 935 55 117ms 19 Aug 2024 458th acotis 935 55 120ms 4 Feb 2025 458th emgordon154 935 55 123ms 19 Mar 2025 First Prev 401–480 of 3,294 Next Last