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 383rd Yewzir 🇧🇪 939 41 1ms 14 Nov 2023 383rd dokutan 939 41 1ms 26 Mar 2024 383rd pardouin 🇫🇷 939 41 1ms 21 Sep 2024 383rd FlyingPenguin223 939 41 2ms 23 Oct 2024 383rd fuzzylojik-golf 🇺🇸 939 41 2ms 3 Jul 2025 383rd edsrzf 🇳🇿 939 41 1ms 22 Jul 2025 383rd snoozingnewt 🇨🇦 939 41 2ms 14 days ago 408th Yewzir 🇧🇪 938 16 36ms 18 Feb 2024 408th emgordon154 938 16 57ms 19 Mar 2025 410th GrayJoKing 🇦🇺 938 55 317ms 21 Nov 2021 410th JayXon 🇺🇸 938 55 316ms 21 Nov 2021 410th Lydxn 🇨🇦 938 55 319ms 21 Nov 2021 410th lynn 938 55 319ms 21 Nov 2021 410th NewDefectus 🇮🇱 938 55 320ms 21 Nov 2021 410th primo-ppcg 🇹🇭 938 55 326ms 21 Nov 2021 410th prplz 🇦🇺 938 55 321ms 21 Nov 2021 410th sisyphus-ppcg 🇦🇺 938 55 322ms 21 Nov 2021 410th inventshah 938 55 315ms 18 Jun 2022 410th m-tkach 🇺🇦 938 55 320ms 26 Jun 2022 410th sean-niemann 🇺🇸 938 55 368ms 3 Nov 2022 410th stefangimmillaro 938 55 323ms 4 Nov 2022 410th MeWhenI 🇻🇦 938 55 319ms 5 Nov 2022 410th Steffan153 🇫🇮 938 55 324ms 26 Nov 2022 410th annaproxy 938 55 312ms 8 Jan 2023 410th DialFrost 🇸🇬 938 55 319ms 12 Jan 2023 410th Shanethegamer 🇺🇸 938 55 322ms 6 Feb 2023 410th btnlq 938 55 314ms 10 Mar 2023 410th namelessiw 938 55 392ms 22 Jul 2023 410th Yewzir 🇧🇪 938 55 321ms 11 Oct 2023 410th AdrienHache 🇫🇷 938 55 313ms 21 Oct 2023 410th Betuaredead 938 55 317ms 11 Nov 2023 410th pardouin 🇫🇷 938 55 364ms 18 Aug 2024 410th voytxt 🇨🇿 938 55 310ms 19 Jan 2025 410th b-illy 🇬🇧 938 55 324ms 21 Jan 2025 410th fuzzylojik-golf 🇺🇸 938 55 368ms 29 May 2025 410th Yax42 🇫🇷 938 55 364ms 31 May 2025 410th edsrzf 🇳🇿 938 55 352ms 22 Jul 2025 410th CaedenHarper 🇨🇦 938 55 376ms 4 Sep 2025 410th snoozingnewt 🇨🇦 938 55 377ms 20 Oct 2025 440th GrayJoKing 🇦🇺 937 33 4ms 20 May 2021 440th primo-ppcg 🇹🇭 937 33 3ms 20 May 2021 440th Lydxn 🇨🇦 937 33 5ms 29 May 2022 443rd AdrienHache 🇫🇷 936 32 52ms 31 Oct 2024 444th JayXon 🇺🇸 936 38 86ms 27 Sep 2021 444th Lydxn 🇨🇦 936 38 89ms 27 Sep 2021 444th stefangimmillaro 936 38 83ms 4 Nov 2022 444th MeWhenI 🇻🇦 936 38 86ms 5 Nov 2022 444th Shanethegamer 🇺🇸 936 38 86ms 6 Feb 2023 444th DialFrost 🇸🇬 936 38 89ms 6 Feb 2023 444th Steffan153 🇫🇮 936 38 84ms 7 Feb 2023 444th sean-niemann 🇺🇸 936 38 86ms 7 Feb 2023 444th ovs-code 🇩🇪 936 38 83ms 17 Jul 2023 444th Yewzir 🇧🇪 936 38 84ms 11 Oct 2023 444th Betuaredead 936 38 86ms 11 Nov 2023 444th dokutan 936 38 86ms 28 Jul 2024 444th pardouin 🇫🇷 936 38 85ms 20 Aug 2024 444th primo-ppcg 🇹🇭 936 38 84ms 12 Apr 2025 444th edsrzf 🇳🇿 936 38 85ms 22 Jul 2025 444th fuzzylojik-golf 🇺🇸 936 38 89ms 7 Aug 2025 444th snoozingnewt 🇨🇦 936 38 86ms 20 Oct 2025 461st prplz 🇦🇺 935 55 118ms 13 Jan 2022 461st GrayJoKing 🇦🇺 935 55 118ms 13 Jan 2022 461st JayXon 🇺🇸 935 55 122ms 13 Jan 2022 461st Lydxn 🇨🇦 935 55 121ms 13 Jan 2022 461st primo-ppcg 🇹🇭 935 55 126ms 14 Jan 2022 461st lynn 935 55 119ms 10 Mar 2022 461st inventshah 935 55 120ms 15 Jun 2022 461st sisyphus-ppcg 🇦🇺 935 55 126ms 8 Aug 2022 461st sean-niemann 🇺🇸 935 55 122ms 3 Nov 2022 461st stefangimmillaro 935 55 131ms 4 Nov 2022 461st andersk 🇺🇸 935 55 118ms 5 Nov 2022 461st MeWhenI 🇻🇦 935 55 118ms 6 Nov 2022 461st Steffan153 🇫🇮 935 55 123ms 27 Nov 2022 461st DialFrost 🇸🇬 935 55 118ms 12 Jan 2023 461st rucin93 🇵🇱 935 55 115ms 19 Jan 2023 461st Shanethegamer 🇺🇸 935 55 116ms 6 Feb 2023 461st ovs-code 🇩🇪 935 55 133ms 17 Jul 2023 461st Yewzir 🇧🇪 935 55 120ms 11 Oct 2023 461st Betuaredead 935 55 114ms 11 Nov 2023 461st dokutan 935 55 120ms 27 Mar 2024 First Prev 401–480 of 3,296 Next Last