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 372nd snoozingnewt 🇨🇦 938 55 377ms 20 Oct 2025 402nd GrayJoKing 🇦🇺 937 33 4ms 20 May 2021 402nd primo-ppcg 🇹🇭 937 33 3ms 20 May 2021 402nd Lydxn 🇨🇦 937 33 5ms 29 May 2022 405th JayXon 🇺🇸 936 38 86ms 27 Sep 2021 405th Lydxn 🇨🇦 936 38 89ms 27 Sep 2021 405th stefangimmillaro 936 38 83ms 4 Nov 2022 405th MeWhenI 🇻🇦 936 38 86ms 5 Nov 2022 405th Shanethegamer 🇺🇸 936 38 86ms 6 Feb 2023 405th DialFrost 🇸🇬 936 38 89ms 6 Feb 2023 405th Steffan153 🇫🇮 936 38 84ms 7 Feb 2023 405th sean-niemann 🇺🇸 936 38 86ms 7 Feb 2023 405th ovs-code 🇩🇪 936 38 83ms 17 Jul 2023 405th Yewzir 🇧🇪 936 38 84ms 11 Oct 2023 405th Betuaredead 936 38 86ms 11 Nov 2023 405th dokutan 936 38 86ms 28 Jul 2024 405th pardouin 🇫🇷 936 38 85ms 20 Aug 2024 405th primo-ppcg 🇹🇭 936 38 84ms 12 Apr 2025 405th edsrzf 🇳🇿 936 38 85ms 22 Jul 2025 405th fuzzylojik-golf 🇺🇸 936 38 89ms 7 Aug 2025 405th snoozingnewt 🇨🇦 936 38 86ms 20 Oct 2025 422nd prplz 🇦🇺 935 55 118ms 13 Jan 2022 422nd GrayJoKing 🇦🇺 935 55 118ms 13 Jan 2022 422nd JayXon 🇺🇸 935 55 122ms 13 Jan 2022 422nd Lydxn 🇨🇦 935 55 121ms 13 Jan 2022 422nd primo-ppcg 🇹🇭 935 55 126ms 14 Jan 2022 422nd lynn 935 55 119ms 10 Mar 2022 422nd inventshah 935 55 120ms 15 Jun 2022 422nd sisyphus-ppcg 🇦🇺 935 55 126ms 8 Aug 2022 422nd sean-niemann 🇺🇸 935 55 122ms 3 Nov 2022 422nd stefangimmillaro 935 55 131ms 4 Nov 2022 422nd andersk 🇺🇸 935 55 118ms 5 Nov 2022 422nd MeWhenI 🇻🇦 935 55 118ms 6 Nov 2022 422nd Steffan153 🇫🇮 935 55 123ms 27 Nov 2022 422nd DialFrost 🇸🇬 935 55 118ms 12 Jan 2023 422nd rucin93 🇵🇱 935 55 115ms 19 Jan 2023 422nd Shanethegamer 🇺🇸 935 55 116ms 6 Feb 2023 422nd ovs-code 🇩🇪 935 55 133ms 17 Jul 2023 422nd Yewzir 🇧🇪 935 55 120ms 11 Oct 2023 422nd Betuaredead 935 55 114ms 11 Nov 2023 422nd dokutan 935 55 120ms 27 Mar 2024 422nd pardouin 🇫🇷 935 55 117ms 19 Aug 2024 422nd acotis 935 55 120ms 4 Feb 2025 422nd emgordon154 935 55 123ms 19 Mar 2025 422nd fuzzylojik-golf 🇺🇸 935 55 116ms 17 Jun 2025 422nd edsrzf 🇳🇿 935 55 117ms 22 Jul 2025 422nd kumavale 935 55 120ms 26 Aug 2025 422nd snoozingnewt 🇨🇦 935 55 115ms 20 Oct 2025 449th henkma 934 51 111ms 26 Jun 2020 449th lynn 934 51 113ms 8 Oct 2021 451st edsrzf 🇳🇿 934 60 540ms 26 Sep 2025 451st DialFrost 🇸🇬 934 60 442ms 26 Sep 2025 451st sean-niemann 🇺🇸 934 60 455ms 26 Sep 2025 451st JayXon 🇺🇸 934 60 435ms 26 Sep 2025 451st pardouin 🇫🇷 934 60 546ms 26 Sep 2025 451st fuzzylojik-golf 🇺🇸 934 60 488ms 26 Sep 2025 451st namelessiw 934 60 435ms 2 Oct 2025 451st Yewzir 🇧🇪 934 60 416ms 2 Oct 2025 451st Yax42 🇫🇷 934 60 502ms 3 Oct 2025 451st b-illy 🇬🇧 934 60 454ms 3 Oct 2025 451st ovs-code 🇩🇪 934 60 435ms 3 Oct 2025 451st CaedenHarper 🇨🇦 934 60 443ms 3 Oct 2025 451st m-tkach 🇺🇦 934 60 633ms 3 Oct 2025 451st stefangimmillaro 934 60 416ms 6 Oct 2025 451st snoozingnewt 🇨🇦 934 60 522ms 20 Oct 2025 451st sisyphus-ppcg 🇦🇺 934 60 485ms 23 days ago 451st Lydxn 🇨🇦 934 60 347ms 7 days ago 451st KasperKivimaeki 🇫🇮 934 60 377ms 6 days ago 469th rak1507 🇬🇧 933 18 2ms 11 Mar 2022 469th lynn 933 18 2ms 27 May 2022 469th Steffan153 🇫🇮 933 18 2ms 22 Feb 2023 469th pardouin 🇫🇷 933 18 2ms 16 Apr 2025 469th AdrienHache 🇫🇷 933 18 4ms 17 days ago 474th NewDefectus 🇮🇱 933 29 34ms 8 May 2021 474th akshatj27 🇦🇶 933 29 41ms 11 Jan 2022 474th m-tkach 🇺🇦 933 29 36ms 23 Nov 2022 474th Steffan153 🇫🇮 933 29 39ms 1 Jan 2023 474th DialFrost 🇸🇬 933 29 35ms 13 Jan 2023 474th sean-niemann 🇺🇸 933 29 43ms 29 Jan 2023 474th MeWhenI 🇻🇦 933 29 50ms 30 Jan 2023 First Prev 401–480 of 3,273 Next Last