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 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 473rd sisyphus-ppcg 🇦🇺 933 29 53ms 25 Dec 2023 473rd Yewzir 🇧🇪 933 29 35ms 25 Dec 2023 473rd GrayJoKing 🇦🇺 933 29 34ms 26 Dec 2023 473rd Lydxn 🇨🇦 933 29 37ms 29 Dec 2023 473rd xsot 🇸🇬 933 29 35ms 30 Dec 2023 473rd fuzzylojik-golf 🇺🇸 933 29 36ms 30 Aug 2025 473rd snoozingnewt 🇨🇦 933 29 41ms 15 days ago 488th Yewzir 🇧🇪 933 33 1ms 18 Nov 2025 488th sean-niemann 🇺🇸 933 33 1ms 18 Nov 2025 488th rucin93 🇵🇱 933 33 2ms 18 Nov 2025 488th edsrzf 🇳🇿 933 33 1ms 18 Nov 2025 488th DialFrost 🇸🇬 933 33 1ms 19 Nov 2025 488th JayXon 🇺🇸 933 33 1ms 19 Nov 2025 488th GrayJoKing 🇦🇺 933 33 1ms 19 Nov 2025 488th pardouin 🇫🇷 933 33 1ms 19 Nov 2025 488th snoozingnewt 🇨🇦 933 33 1ms 15 days ago 497th Lydxn 🇨🇦 933 34 3ms 12 May 2023 497th Steffan153 🇫🇮 933 34 4ms 14 May 2023 497th sean-niemann 🇺🇸 933 34 4ms 21 Apr 2025 500th GrayJoKing 🇦🇺 933 48 1ms 9 Feb 2021 500th prplz 🇦🇺 933 48 1ms 10 Feb 2021 500th NewDefectus 🇮🇱 933 48 1ms 8 May 2021 500th orthoplex 🇨🇽 933 48 1ms 12 Aug 2021 500th akshatj27 🇦🇶 933 48 1ms 11 Jan 2022 500th lynn 933 48 1ms 3 Jun 2022 500th AlephSquirrel 933 48 1ms 18 Jul 2022 500th stefangimmillaro 933 48 2ms 4 Nov 2022 500th MeWhenI 🇻🇦 933 48 1ms 5 Nov 2022 500th emplv 🇱🇻 933 48 1ms 22 Nov 2022 500th Steffan153 🇫🇮 933 48 1ms 26 Nov 2022 500th rucin93 🇵🇱 933 48 1ms 22 Jan 2023 500th voytxt 🇨🇿 933 48 1ms 19 Jan 2025 500th emgordon154 933 48 2ms 1 Jun 2025 500th edsrzf 🇳🇿 933 48 2ms 4 Sep 2025 515th Lydxn 🇨🇦 932 67 53ms 1 Jan 2022 515th prplz 🇦🇺 932 67 80ms 1 Jan 2022 515th JayXon 🇺🇸 932 67 57ms 1 Jan 2022 515th primo-ppcg 🇹🇭 932 67 73ms 18 Jan 2022 515th GrayJoKing 🇦🇺 932 67 75ms 18 Feb 2022 515th Irratix 🇳🇱 932 67 66ms 22 Mar 2022 515th inventshah 932 67 64ms 15 Jun 2022 515th sean-niemann 🇺🇸 932 67 56ms 4 Nov 2022 515th MeWhenI 🇻🇦 932 67 73ms 5 Nov 2022 515th Steffan153 🇫🇮 932 67 71ms 27 Nov 2022 515th DialFrost 🇸🇬 932 67 57ms 12 Jan 2023 515th Shanethegamer 🇺🇸 932 67 82ms 6 Feb 2023 515th Alex-x90 🇺🇸 932 67 64ms 24 Feb 2023 515th sisyphus-ppcg 🇦🇺 932 67 55ms 23 Mar 2023 515th rucin93 🇵🇱 932 67 65ms 20 Jun 2023 515th xsot 🇸🇬 932 67 63ms 14 Jul 2023 515th ovs-code 🇩🇪 932 67 72ms 17 Jul 2023 515th Yewzir 🇧🇪 932 67 60ms 11 Oct 2023 515th Betuaredead 932 67 57ms 11 Nov 2023 515th pardouin 🇫🇷 932 67 50ms 17 Aug 2024 515th b-illy 🇬🇧 932 67 71ms 5 Jun 2025 515th fuzzylojik-golf 🇺🇸 932 67 68ms 19 Aug 2025 515th edsrzf 🇳🇿 932 67 63ms 4 Sep 2025 515th CaedenHarper 🇨🇦 932 67 80ms 4 Sep 2025 515th KasperKivimaeki 🇫🇮 932 67 65ms 18 Nov 2025 515th snoozingnewt 🇨🇦 932 67 59ms 15 days ago 541st primo-ppcg 🇹🇭 931 41 121ms 18 Jun 2019 541st JayXon 🇺🇸 931 41 118ms 9 Feb 2021 541st GrayJoKing 🇦🇺 931 41 127ms 9 Feb 2021 541st prplz 🇦🇺 931 41 125ms 10 Feb 2021 541st sisyphus-ppcg 🇦🇺 931 41 124ms 10 Feb 2021 541st Lydxn 🇨🇦 931 41 119ms 10 Feb 2021 541st lynn 931 41 119ms 11 Sep 2021 541st m-tkach 🇺🇦 931 41 117ms 24 Oct 2022 541st sean-niemann 🇺🇸 931 41 117ms 3 Nov 2022 541st MeWhenI 🇻🇦 931 41 117ms 5 Nov 2022 541st Steffan153 🇫🇮 931 41 121ms 3 Dec 2022 541st DialFrost 🇸🇬 931 41 117ms 12 Jan 2023 541st Shanethegamer 🇺🇸 931 41 122ms 6 Feb 2023 541st MWI-polygolf 931 41 121ms 18 Feb 2023 541st steffan-polygolf 931 41 124ms 19 Feb 2023 541st stefangimmillaro 931 41 123ms 11 Jun 2023 541st ovs-code 🇩🇪 931 41 120ms 17 Jul 2023 541st Yewzir 🇧🇪 931 41 125ms 20 Oct 2023 541st Betuaredead 931 41 117ms 11 Nov 2023 541st dokutan 931 41 118ms 26 Mar 2024 First Prev 481–560 of 3,270 Next Last