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 462nd dokutan 935 55 120ms 27 Mar 2024 462nd pardouin 🇫🇷 935 55 117ms 19 Aug 2024 462nd acotis 935 55 120ms 4 Feb 2025 462nd emgordon154 935 55 123ms 19 Mar 2025 462nd fuzzylojik-golf 🇺🇸 935 55 116ms 17 Jun 2025 462nd edsrzf 🇳🇿 935 55 117ms 22 Jul 2025 462nd kumavale 935 55 120ms 26 Aug 2025 462nd snoozingnewt 🇨🇦 935 55 115ms 20 Oct 2025 489th henkma 934 51 111ms 26 Jun 2020 489th lynn 934 51 113ms 8 Oct 2021 491st edsrzf 🇳🇿 934 60 540ms 26 Sep 2025 491st DialFrost 🇸🇬 934 60 442ms 26 Sep 2025 491st sean-niemann 🇺🇸 934 60 455ms 26 Sep 2025 491st JayXon 🇺🇸 934 60 435ms 26 Sep 2025 491st pardouin 🇫🇷 934 60 546ms 26 Sep 2025 491st fuzzylojik-golf 🇺🇸 934 60 488ms 26 Sep 2025 491st namelessiw 934 60 435ms 2 Oct 2025 491st Yewzir 🇧🇪 934 60 416ms 2 Oct 2025 491st Yax42 🇫🇷 934 60 502ms 3 Oct 2025 491st b-illy 🇬🇧 934 60 454ms 3 Oct 2025 491st ovs-code 🇩🇪 934 60 435ms 3 Oct 2025 491st CaedenHarper 🇨🇦 934 60 443ms 3 Oct 2025 491st m-tkach 🇺🇦 934 60 633ms 3 Oct 2025 491st stefangimmillaro 934 60 416ms 6 Oct 2025 491st snoozingnewt 🇨🇦 934 60 522ms 20 Oct 2025 491st sisyphus-ppcg 🇦🇺 934 60 485ms 22 days ago 491st Lydxn 🇨🇦 934 60 347ms 6 days ago 491st KasperKivimaeki 🇫🇮 934 60 377ms 6 days ago 509th rak1507 🇬🇧 933 18 2ms 11 Mar 2022 509th lynn 933 18 2ms 27 May 2022 509th Steffan153 🇫🇮 933 18 2ms 22 Feb 2023 509th pardouin 🇫🇷 933 18 2ms 16 Apr 2025 509th AdrienHache 🇫🇷 933 18 4ms 17 days ago 514th Waffle3z 933 30 35ms 10 Feb 2021 514th lynn 933 30 33ms 11 Sep 2021 514th Irratix 🇳🇱 933 30 36ms 22 Mar 2022 514th orthoplex 🇨🇽 933 30 35ms 30 Mar 2022 514th SirBogman 🇺🇸 933 30 41ms 31 May 2022 514th inventshah 933 30 32ms 18 Jun 2022 514th jared-hughes 933 30 32ms 10 Sep 2022 514th Shanethegamer 🇺🇸 933 30 35ms 6 Feb 2023 514th ovs-code 🇩🇪 933 30 38ms 17 Jul 2023 514th Betuaredead 933 30 37ms 11 Nov 2023 514th dokutan 933 30 43ms 26 Mar 2024 514th BREMAUCY 🇫🇷 933 30 45ms 14 May 2024 514th FlyingPenguin223 933 30 44ms 23 Oct 2024 514th emgordon154 933 30 45ms 18 Mar 2025 514th edsrzf 🇳🇿 933 30 42ms 26 Jul 2025 514th CaedenHarper 🇨🇦 933 30 35ms 13 Sep 2025 530th Yewzir 🇧🇪 933 33 1ms 18 Nov 2025 530th sean-niemann 🇺🇸 933 33 1ms 18 Nov 2025 530th rucin93 🇵🇱 933 33 2ms 18 Nov 2025 530th edsrzf 🇳🇿 933 33 1ms 18 Nov 2025 530th DialFrost 🇸🇬 933 33 1ms 19 Nov 2025 530th JayXon 🇺🇸 933 33 1ms 19 Nov 2025 530th GrayJoKing 🇦🇺 933 33 1ms 19 Nov 2025 530th pardouin 🇫🇷 933 33 1ms 19 Nov 2025 530th snoozingnewt 🇨🇦 933 33 1ms 15 days ago 539th jared-hughes 933 49 1ms 16 Mar 2022 539th m-tkach 🇺🇦 933 49 1ms 15 Aug 2022 539th emgordon154 933 49 2ms 20 Mar 2025 542nd Lydxn 🇨🇦 932 67 53ms 1 Jan 2022 542nd prplz 🇦🇺 932 67 80ms 1 Jan 2022 542nd JayXon 🇺🇸 932 67 57ms 1 Jan 2022 542nd primo-ppcg 🇹🇭 932 67 73ms 18 Jan 2022 542nd GrayJoKing 🇦🇺 932 67 75ms 18 Feb 2022 542nd Irratix 🇳🇱 932 67 66ms 22 Mar 2022 542nd inventshah 932 67 64ms 15 Jun 2022 542nd sean-niemann 🇺🇸 932 67 56ms 4 Nov 2022 542nd MeWhenI 🇻🇦 932 67 73ms 5 Nov 2022 542nd Steffan153 🇫🇮 932 67 71ms 27 Nov 2022 542nd DialFrost 🇸🇬 932 67 57ms 12 Jan 2023 542nd Shanethegamer 🇺🇸 932 67 82ms 6 Feb 2023 542nd Alex-x90 🇺🇸 932 67 64ms 24 Feb 2023 542nd sisyphus-ppcg 🇦🇺 932 67 55ms 23 Mar 2023 542nd rucin93 🇵🇱 932 67 65ms 20 Jun 2023 542nd xsot 🇸🇬 932 67 63ms 14 Jul 2023 542nd ovs-code 🇩🇪 932 67 72ms 17 Jul 2023 542nd Yewzir 🇧🇪 932 67 60ms 11 Oct 2023 542nd Betuaredead 932 67 57ms 11 Nov 2023 First Prev 481–560 of 3,296 Next Last