The Calendar hole will go live in approximately 8 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 458th fuzzylojik-golf 🇺🇸 935 55 116ms 17 Jun 2025 458th edsrzf 🇳🇿 935 55 117ms 22 Jul 2025 458th kumavale 935 55 120ms 26 Aug 2025 458th snoozingnewt 🇨🇦 935 55 115ms 20 Oct 2025 485th henkma 934 51 111ms 26 Jun 2020 485th lynn 934 51 113ms 8 Oct 2021 487th edsrzf 🇳🇿 934 60 540ms 26 Sep 2025 487th DialFrost 🇸🇬 934 60 442ms 26 Sep 2025 487th sean-niemann 🇺🇸 934 60 455ms 26 Sep 2025 487th JayXon 🇺🇸 934 60 435ms 26 Sep 2025 487th pardouin 🇫🇷 934 60 546ms 26 Sep 2025 487th fuzzylojik-golf 🇺🇸 934 60 488ms 26 Sep 2025 487th namelessiw 934 60 435ms 2 Oct 2025 487th Yewzir 🇧🇪 934 60 416ms 2 Oct 2025 487th Yax42 🇫🇷 934 60 502ms 3 Oct 2025 487th b-illy 🇬🇧 934 60 454ms 3 Oct 2025 487th ovs-code 🇩🇪 934 60 435ms 3 Oct 2025 487th CaedenHarper 🇨🇦 934 60 443ms 3 Oct 2025 487th m-tkach 🇺🇦 934 60 633ms 3 Oct 2025 487th stefangimmillaro 934 60 416ms 6 Oct 2025 487th snoozingnewt 🇨🇦 934 60 522ms 20 Oct 2025 487th sisyphus-ppcg 🇦🇺 934 60 485ms 27 days ago 487th Lydxn 🇨🇦 934 60 347ms 11 days ago 487th KasperKivimaeki 🇫🇮 934 60 377ms 11 days ago 505th rak1507 🇬🇧 933 18 2ms 11 Mar 2022 505th lynn 933 18 2ms 27 May 2022 505th Steffan153 🇫🇮 933 18 2ms 22 Feb 2023 505th pardouin 🇫🇷 933 18 2ms 16 Apr 2025 505th AdrienHache 🇫🇷 933 18 4ms 21 days ago 510th Waffle3z 933 30 35ms 10 Feb 2021 510th lynn 933 30 33ms 11 Sep 2021 510th Irratix 🇳🇱 933 30 36ms 22 Mar 2022 510th orthoplex 🇨🇽 933 30 35ms 30 Mar 2022 510th SirBogman 🇺🇸 933 30 41ms 31 May 2022 510th inventshah 933 30 32ms 18 Jun 2022 510th jared-hughes 933 30 32ms 10 Sep 2022 510th Shanethegamer 🇺🇸 933 30 35ms 6 Feb 2023 510th ovs-code 🇩🇪 933 30 38ms 17 Jul 2023 510th Betuaredead 933 30 37ms 11 Nov 2023 510th dokutan 933 30 43ms 26 Mar 2024 510th BREMAUCY 🇫🇷 933 30 45ms 14 May 2024 510th FlyingPenguin223 933 30 44ms 23 Oct 2024 510th emgordon154 933 30 45ms 18 Mar 2025 510th edsrzf 🇳🇿 933 30 42ms 26 Jul 2025 510th CaedenHarper 🇨🇦 933 30 35ms 13 Sep 2025 510th blaztoma 🇱🇹 933 30 37ms 4 days ago 527th Yewzir 🇧🇪 933 33 1ms 18 Nov 2025 527th sean-niemann 🇺🇸 933 33 1ms 18 Nov 2025 527th rucin93 🇵🇱 933 33 2ms 18 Nov 2025 527th edsrzf 🇳🇿 933 33 1ms 18 Nov 2025 527th DialFrost 🇸🇬 933 33 1ms 19 Nov 2025 527th JayXon 🇺🇸 933 33 1ms 19 Nov 2025 527th GrayJoKing 🇦🇺 933 33 1ms 19 Nov 2025 527th pardouin 🇫🇷 933 33 1ms 19 Nov 2025 527th snoozingnewt 🇨🇦 933 33 1ms 19 days ago 536th jared-hughes 933 49 1ms 16 Mar 2022 536th m-tkach 🇺🇦 933 49 1ms 15 Aug 2022 536th emgordon154 933 49 2ms 20 Mar 2025 539th Lydxn 🇨🇦 932 67 53ms 1 Jan 2022 539th prplz 🇦🇺 932 67 80ms 1 Jan 2022 539th JayXon 🇺🇸 932 67 57ms 1 Jan 2022 539th primo-ppcg 🇹🇭 932 67 73ms 18 Jan 2022 539th GrayJoKing 🇦🇺 932 67 75ms 18 Feb 2022 539th Irratix 🇳🇱 932 67 66ms 22 Mar 2022 539th inventshah 932 67 64ms 15 Jun 2022 539th sean-niemann 🇺🇸 932 67 56ms 4 Nov 2022 539th MeWhenI 🇻🇦 932 67 73ms 5 Nov 2022 539th Steffan153 🇫🇮 932 67 71ms 27 Nov 2022 539th DialFrost 🇸🇬 932 67 57ms 12 Jan 2023 539th Shanethegamer 🇺🇸 932 67 82ms 6 Feb 2023 539th Alex-x90 🇺🇸 932 67 64ms 24 Feb 2023 539th sisyphus-ppcg 🇦🇺 932 67 55ms 23 Mar 2023 539th rucin93 🇵🇱 932 67 65ms 20 Jun 2023 539th xsot 🇸🇬 932 67 63ms 14 Jul 2023 539th ovs-code 🇩🇪 932 67 72ms 17 Jul 2023 539th Yewzir 🇧🇪 932 67 60ms 11 Oct 2023 539th Betuaredead 932 67 57ms 11 Nov 2023 539th pardouin 🇫🇷 932 67 50ms 17 Aug 2024 539th b-illy 🇬🇧 932 67 71ms 5 Jun 2025 539th fuzzylojik-golf 🇺🇸 932 67 68ms 19 Aug 2025 First Prev 481–560 of 3,294 Next Last