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 541st b-illy 🇬🇧 932 67 71ms 5 Jun 2025 541st fuzzylojik-golf 🇺🇸 932 67 68ms 19 Aug 2025 541st edsrzf 🇳🇿 932 67 63ms 4 Sep 2025 541st CaedenHarper 🇨🇦 932 67 80ms 4 Sep 2025 541st KasperKivimaeki 🇫🇮 932 67 65ms 18 Nov 2025 541st snoozingnewt 🇨🇦 932 67 59ms 15 days ago 567th JayXon 🇺🇸 931 41 118ms 9 Feb 2021 567th GrayJoKing 🇦🇺 931 41 127ms 9 Feb 2021 567th primo-ppcg 🇹🇭 931 41 121ms 9 Feb 2021 567th prplz 🇦🇺 931 41 125ms 10 Feb 2021 567th sisyphus-ppcg 🇦🇺 931 41 124ms 10 Feb 2021 567th Lydxn 🇨🇦 931 41 119ms 10 Feb 2021 567th lynn 931 41 119ms 11 Sep 2021 567th m-tkach 🇺🇦 931 41 117ms 24 Oct 2022 567th sean-niemann 🇺🇸 931 41 117ms 3 Nov 2022 567th MeWhenI 🇻🇦 931 41 117ms 5 Nov 2022 567th Steffan153 🇫🇮 931 41 121ms 3 Dec 2022 567th DialFrost 🇸🇬 931 41 117ms 12 Jan 2023 567th Shanethegamer 🇺🇸 931 41 122ms 6 Feb 2023 567th MWI-polygolf 931 41 121ms 18 Feb 2023 567th steffan-polygolf 931 41 124ms 19 Feb 2023 567th stefangimmillaro 931 41 123ms 11 Jun 2023 567th ovs-code 🇩🇪 931 41 120ms 17 Jul 2023 567th Yewzir 🇧🇪 931 41 125ms 20 Oct 2023 567th Betuaredead 931 41 117ms 11 Nov 2023 567th dokutan 931 41 118ms 26 Mar 2024 567th pardouin 🇫🇷 931 41 125ms 17 Aug 2024 567th edsrzf 🇳🇿 931 41 122ms 22 Jul 2025 567th rucin93 🇵🇱 931 41 123ms 24 Jul 2025 567th fuzzylojik-golf 🇺🇸 931 41 116ms 7 Aug 2025 567th snoozingnewt 🇨🇦 931 41 183ms 14 days ago 592nd NewDefectus 🇮🇱 928 22 33ms 10 Oct 2021 592nd yzhs 🇩🇪 928 22 35ms 20 Jul 2022 592nd saltysylvi 928 22 34ms 5 Aug 2022 592nd ashtraypettingzoo 🇺🇸 928 22 33ms 22 Feb 2023 592nd MeWhenI 🇻🇦 928 22 33ms 7 Aug 2023 592nd Yewzir 🇧🇪 928 22 33ms 6 Nov 2023 592nd Natanaelel 🇸🇪 928 22 35ms 28 Nov 2023 592nd orthoplex 🇨🇽 928 22 33ms 20 Jul 2024 600th o0lit3 🇺🇸 928 25 219ms 11 Feb 2021 600th SirBogman 🇺🇸 928 25 115ms 31 May 2022 602nd JayXon 🇺🇸 928 36 122ms 4 Aug 2024 602nd Steffan153 🇫🇮 928 36 123ms 4 Aug 2024 602nd sean-niemann 🇺🇸 928 36 118ms 5 Aug 2024 602nd lukegustafson 🇺🇸 928 36 121ms 5 Aug 2024 602nd Lydxn 🇨🇦 928 36 122ms 6 Aug 2024 602nd rucin93 🇵🇱 928 36 123ms 6 Aug 2024 602nd MeWhenI 🇻🇦 928 36 119ms 6 Aug 2024 602nd sisyphus-ppcg 🇦🇺 928 36 118ms 8 Aug 2024 602nd GrayJoKing 🇦🇺 928 36 125ms 13 Aug 2024 602nd DialFrost 🇸🇬 928 36 124ms 20 Aug 2024 602nd pardouin 🇫🇷 928 36 118ms 3 Sep 2024 602nd emplv 🇱🇻 928 36 123ms 29 Oct 2024 602nd fuzzylojik-golf 🇺🇸 928 36 128ms 2 Aug 2025 602nd Yewzir 🇧🇪 928 36 124ms 18 Nov 2025 616th Lydxn 🇨🇦 928 37 3ms 29 Sep 2022 616th GrayJoKing 🇦🇺 928 37 3ms 29 Sep 2022 616th DialFrost 🇸🇬 928 37 3ms 24 Jan 2023 616th Steffan153 🇫🇮 928 37 3ms 3 Feb 2023 616th sisyphus-ppcg 🇦🇺 928 37 2ms 4 Feb 2023 616th prplz 🇦🇺 928 37 3ms 18 May 2023 616th ovs-code 🇩🇪 928 37 3ms 17 Jul 2023 616th sean-niemann 🇺🇸 928 37 3ms 23 Oct 2023 616th xsot 🇸🇬 928 37 2ms 8 Feb 2024 616th Yewzir 🇧🇪 928 37 2ms 2 Mar 2024 616th pardouin 🇫🇷 928 37 3ms 20 Aug 2024 616th edsrzf 🇳🇿 928 37 3ms 4 Sep 2025 628th inventshah 927 40 1ms 30 Oct 2022 628th Lydxn 🇨🇦 927 40 1ms 30 Oct 2022 628th GrayJoKing 🇦🇺 927 40 1ms 3 Nov 2022 628th sisyphus-ppcg 🇦🇺 927 40 2ms 3 Nov 2022 628th sean-niemann 🇺🇸 927 40 1ms 4 Nov 2022 628th btnlq 927 40 2ms 5 Nov 2022 628th MeWhenI 🇻🇦 927 40 1ms 5 Nov 2022 628th primo-ppcg 🇹🇭 927 40 1ms 6 Nov 2022 628th Steffan153 🇫🇮 927 40 1ms 26 Nov 2022 628th DialFrost 🇸🇬 927 40 2ms 12 Jan 2023 628th prplz 🇦🇺 927 40 1ms 12 Jan 2023 628th Shanethegamer 🇺🇸 927 40 1ms 6 Feb 2023 628th JayXon 🇺🇸 927 40 2ms 16 Mar 2023 First Prev 561–640 of 3,296 Next Last