The Calendar hole will go live in approximately 12 days. Why not try and solve it ahead of time?
Pernicious Numbers in all languages in chars. 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 Chars Time Submitted 797th Lydxn 🇨🇦 915 58 1ms 19 Jul 2023 802nd Natanaelel 🇸🇪 914 36 8ms 25 Jun 2022 802nd scpchicken 🇵🇼 914 36 9ms 25 Feb 2023 802nd Yax42 🇫🇷 914 36 9ms 5 Sep 2025 805th Steffan153 🇫🇮 914 47 5ms 9 Aug 2024 805th sean-niemann 🇺🇸 914 47 7ms 17 Aug 2025 807th jared-hughes 914 49 1ms 16 Mar 2022 807th m-tkach 🇺🇦 914 49 1ms 15 Aug 2022 807th kkoenig 914 49 1ms 4 Jan 2024 807th dokutan 914 49 1ms 27 Apr 2024 807th FlyingPenguin223 914 49 1ms 18 Dec 2024 807th Yax42 🇫🇷 914 49 1ms 15 Oct 2025 813th marshallward 🇺🇸 913 49 39ms 20 Nov 2022 814th MeWhenI 🇻🇦 912 35 4ms 24 Jun 2022 815th prplz 🇦🇺 912 39 77ms 10 Feb 2021 815th GrayJoKing 🇦🇺 912 39 78ms 11 Feb 2021 815th sisyphus-ppcg 🇦🇺 912 39 77ms 30 May 2021 815th lynn 912 39 77ms 11 Sep 2021 815th inventshah 912 39 76ms 18 Jun 2022 815th MWI-polygolf 912 39 79ms 18 Feb 2023 815th steffan-polygolf 912 39 77ms 19 Feb 2023 815th rucin93 🇵🇱 912 39 77ms 23 Apr 2023 815th Yax42 🇫🇷 912 39 78ms 4 Oct 2025 824th Lydxn 🇨🇦 912 60 387ms 27 Feb 2022 824th JayXon 🇺🇸 912 60 448ms 27 Feb 2022 824th GrayJoKing 🇦🇺 912 60 421ms 28 Feb 2022 824th lynn 912 60 438ms 3 Jun 2022 824th sean-niemann 🇺🇸 912 60 487ms 4 Nov 2022 824th MeWhenI 🇻🇦 912 60 425ms 5 Nov 2022 824th Steffan153 🇫🇮 912 60 436ms 1 Jan 2023 824th DialFrost 🇸🇬 912 60 462ms 13 Jan 2023 824th Shanethegamer 🇺🇸 912 60 497ms 6 Feb 2023 824th sisyphus-ppcg 🇦🇺 912 60 441ms 23 Mar 2023 824th prplz 🇦🇺 912 60 460ms 22 May 2023 824th ovs-code 🇩🇪 912 60 435ms 17 Jul 2023 824th Yewzir 🇧🇪 912 60 420ms 11 Oct 2023 824th Betuaredead 912 60 432ms 11 Nov 2023 824th pardouin 🇫🇷 912 60 465ms 18 Aug 2024 824th fuzzylojik-golf 🇺🇸 912 60 503ms 18 Jul 2025 824th edsrzf 🇳🇿 912 60 432ms 4 Sep 2025 824th snoozingnewt 🇨🇦 912 60 451ms 20 Oct 2025 842nd Lydxn 🇨🇦 911 68 24ms 16 Apr 2022 842nd JayXon 🇺🇸 911 68 24ms 17 Apr 2022 842nd prplz 🇦🇺 911 68 24ms 17 Apr 2022 842nd primo-ppcg 🇹🇭 911 68 25ms 25 Jun 2022 842nd m-tkach 🇺🇦 911 68 25ms 26 Jun 2022 842nd emplv 🇱🇻 911 68 25ms 22 Nov 2022 842nd Steffan153 🇫🇮 911 68 24ms 24 Jan 2023 842nd DialFrost 🇸🇬 911 68 25ms 5 Feb 2023 842nd GrayJoKing 🇦🇺 911 68 26ms 19 Mar 2023 842nd Shanethegamer 🇺🇸 911 68 25ms 19 Mar 2023 842nd sean-niemann 🇺🇸 911 68 25ms 13 Apr 2023 842nd Betuaredead 911 68 23ms 13 Nov 2023 842nd Yewzir 🇧🇪 911 68 25ms 14 Nov 2023 842nd pardouin 🇫🇷 911 68 23ms 19 Aug 2024 842nd edsrzf 🇳🇿 911 68 26ms 22 Jul 2025 842nd fuzzylojik-golf 🇺🇸 911 68 25ms 20 Aug 2025 842nd snoozingnewt 🇨🇦 911 68 24ms 13 days ago 859th Lydxn 🇨🇦 909 51 3ms 16 Jul 2023 859th GrayJoKing 🇦🇺 909 51 3ms 16 Jul 2023 859th MeWhenI 🇻🇦 909 51 4ms 16 Jul 2023 859th Steffan153 🇫🇮 909 51 3ms 16 Jul 2023 859th btnlq 909 51 3ms 16 Jul 2023 859th ovs-code 🇩🇪 909 51 3ms 17 Jul 2023 859th sean-niemann 🇺🇸 909 51 4ms 12 Jun 2025 859th fuzzylojik-golf 🇺🇸 909 51 4ms 17 Sep 2025 867th canissimia 🇦🇶 906 139 2ms 10 Jul 2021 868th dokutan 905 57 318ms 26 Mar 2024 869th prplz 🇦🇺 905 62 25ms 26 Dec 2022 869th Steffan153 🇫🇮 905 62 26ms 26 Dec 2022 869th GrayJoKing 🇦🇺 905 62 25ms 4 Jan 2023 869th DialFrost 🇸🇬 905 62 27ms 12 Jan 2023 869th m-tkach 🇺🇦 905 62 25ms 12 Jan 2023 869th Lydxn 🇨🇦 905 62 26ms 13 Jan 2023 869th MeWhenI 🇻🇦 905 62 25ms 14 Jan 2023 869th Shanethegamer 🇺🇸 905 62 25ms 6 Feb 2023 869th lynn 905 62 25ms 12 Jul 2023 869th Yewzir 🇧🇪 905 62 25ms 12 Oct 2023 869th Betuaredead 905 62 25ms 11 Nov 2023 869th pardouin 🇫🇷 905 62 26ms 19 Aug 2024 First Prev 801–880 of 3,273 Next Last