The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
Pernicious Numbers (Long) 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 481st MarcMush 🇫🇷 848 49 514ms 11 Jan 2024 481st antimon2 🇯🇵 848 49 346ms 5 May 2024 483rd MeWhenI 🇻🇦 846 68 85ms 24 Dec 2024 483rd pardouin 🇫🇷 846 68 139ms 23 Apr 2025 485th GrayJoKing 🇦🇺 845 73 44ms 26 Oct 2023 486th Shanethegamer 🇺🇸 845 80 389ms 26 Apr 2023 486th DialFrost 🇸🇬 845 80 431ms 3 Jun 2024 486th ovs-code 🇩🇪 845 80 427ms 23 Jul 2024 489th ovs-code 🇩🇪 845 149 509ms 27 Mar 2025 490th Shanethegamer 🇺🇸 844 54 360ms 16 Jan 2024 490th Yewzir 🇧🇪 844 54 388ms 24 Feb 2024 492nd emgordon154 844 133 1,931ms 6 hours ago 493rd DialFrost 🇸🇬 843 81 24ms 23 Dec 2024 493rd fuzzylojik-golf 🇺🇸 843 81 24ms 20 Aug 2025 495th QuincyNash 🇺🇸 842 59 21ms 1 Dec 2022 495th yzhs 🇩🇪 842 59 23ms 23 Jun 2023 495th AlexanderFair 842 59 23ms 18 Jul 2023 495th Grrisly 842 59 16ms 30 Mar 2024 499th m-tkach 🇺🇦 842 87 87ms 22 Nov 2022 499th sean-niemann 🇺🇸 842 87 70ms 7 Feb 2023 501st GrayJoKing 🇦🇺 842 92 28ms 26 Oct 2023 502nd anter69 🇭🇺 837 47 54ms 24 Jan 2023 502nd emgordon154 837 47 49ms 19 Mar 2025 502nd Lv0Sys 🇵🇱 837 47 55ms 11 days ago 505th MeWhenI 🇻🇦 837 51 707ms 15 Sep 2025 505th dokutan 837 51 676ms 16 days ago 507th Steffan153 🇫🇮 837 56 28ms 9 Feb 2023 507th sean-niemann 🇺🇸 837 56 26ms 2 Aug 2024 509th MeWhenI 🇻🇦 837 64 52ms 9 Apr 2024 510th snoozingnewt 🇨🇦 837 96 120ms 19 days ago 511th ovs-code 🇩🇪 835 74 332ms 12 Nov 2023 512th duckyluuk 🇳🇱 833 69 93ms 25 Dec 2024 513th Steffan153 🇫🇮 833 75 49ms 22 Aug 2024 514th primo-ppcg 🇹🇭 833 82 25ms 20 Nov 2022 515th primo-ppcg 🇹🇭 832 135 1,735ms 15 Sep 2025 516th janbehrens 🇩🇪 831 50 500ms 11 Jul 2023 516th Yewzir 🇧🇪 831 50 387ms 26 Feb 2024 518th emgordon154 831 62 4,090ms 8 Nov 2024 519th lynn 830 31 138ms 16 Oct 2023 520th SirBogman 🇺🇸 829 60 41ms 9 Jan 2024 521st GolfingSuccess 🇬🇷 828 29 3ms 25 Feb 2023 521st 5cw 🇺🇸 828 29 5ms 10 Apr 2023 521st codereport 🇨🇦 828 29 3ms 17 May 2024 524th neel11235813 828 55 373ms 27 Mar 2024 524th dokutan 828 55 387ms 14 Jun 2024 526th janbehrens 🇩🇪 828 60 24ms 20 Nov 2022 526th Omega65536 🇩🇪 828 60 17ms 24 Nov 2022 526th Fracture17 828 60 19ms 13 Apr 2023 526th GolfingSuccess 🇬🇷 828 60 18ms 17 Oct 2023 526th bzijlema 🇳🇱 828 60 29ms 22 Jul 2024 526th bizy-coder 828 60 18ms 15 Aug 2024 532nd Ripick 827 69 155ms 8 Jan 2023 532nd dokutan 827 69 155ms 31 Dec 2023 532nd Yewzir 🇧🇪 827 69 168ms 14 Feb 2024 535th MeWhenI 🇻🇦 824 64 23ms 12 Dec 2023 535th emgordon154 824 64 23ms 10 Dec 2024 537th jared-hughes 823 89 57ms 20 Nov 2022 537th roupiq 🇵🇱 823 89 73ms 3 Jan 2024 537th Herbert00709 🇵🇱 823 89 75ms 7 Jun 2024 537th DialFrost 🇸🇬 823 89 78ms 17 Jun 2024 537th KasperKivimaeki 🇫🇮 823 89 60ms 11 days ago 542nd Yax42 🇫🇷 822 77 458ms 21 Apr 2025 543rd snoozingnewt 🇨🇦 820 48 59ms 23 Oct 2025 544th ian-h-chamberlain 🇺🇸 815 84 141ms 2 days ago 545th Natanaelel 🇸🇪 814 51 74ms 26 Sep 2023 546th KatieLG 🇬🇧 814 56 364ms 28 Oct 2024 547th Eilonlif 🇮🇱 814 61 17ms 9 Dec 2022 547th SirFireball3521 814 61 16ms 9 Mar 2023 547th minhtrancccp 814 61 19ms 11 Jan 2024 547th stertooy 🇧🇪 814 61 17ms 14 Jun 2024 551st janbehrens 🇩🇪 814 83 420ms 20 Nov 2022 552nd Steffan153 🇫🇮 812 66 48ms 16 Jan 2023 552nd CLOStrophobic 🇮🇹 812 66 54ms 3 Mar 2025 554th MeWhenI 🇻🇦 812 155 461ms 28 Mar 2025 555th Steffan153 🇫🇮 811 35 342ms 23 Nov 2022 556th DialFrost 🇸🇬 808 139 1,670ms 13 Sep 2025 557th rucin93 🇵🇱 807 156 526ms 20 Mar 2025 558th snoozingnewt 🇨🇦 805 53 693ms 23 Oct 2025 559th GrayJoKing 🇦🇺 805 66 34ms 1 Nov 2023 560th MichalMarsalek 🇨🇿 804 71 155ms 16 Dec 2022 First Prev 481–560 of 1,799 Next Last