The Calendar hole will go live in approximately 7 days. Why not try and solve it ahead of time?
Pernicious Numbers (Long) 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 480th pardouin 🇫🇷 856 69 52ms 25 Apr 2025 480th DialFrost 🇸🇬 856 69 50ms 25 Apr 2025 483rd emplv 🇱🇻 853 80 24ms 30 Nov 2022 484th MeWhenI 🇻🇦 852 64 23ms 12 Dec 2023 484th emgordon154 852 64 23ms 10 Dec 2024 484th error256 852 64 25ms 100 mins ago 487th Steffan153 🇫🇮 852 86 59ms 14 Jan 2023 487th tailorspy 852 86 62ms 24 May 2024 487th snyderek 🇺🇸 852 86 57ms 13 Oct 2024 490th kg583 🇺🇸 850 63 47ms 26 Aug 2025 491st primo-ppcg 🇹🇭 849 62 82ms 20 Nov 2022 492nd Shanethegamer 🇺🇸 848 49 453ms 10 Dec 2023 493rd Yewzir 🇧🇪 846 56 379ms 24 Feb 2024 494th MeWhenI 🇻🇦 846 68 85ms 24 Dec 2024 495th GrayJoKing 🇦🇺 845 73 44ms 26 Oct 2023 496th Shanethegamer 🇺🇸 845 82 389ms 21 Nov 2022 497th ovs-code 🇩🇪 845 149 509ms 27 Mar 2025 498th primo-ppcg 🇹🇭 844 135 1,735ms 15 Sep 2025 499th janbehrens 🇩🇪 843 60 24ms 20 Nov 2022 499th Omega65536 🇩🇪 843 60 17ms 24 Nov 2022 499th Just4FunCoder 843 60 16ms 24 Mar 2023 499th Fracture17 843 60 19ms 13 Apr 2023 499th GolfingSuccess 🇬🇷 843 60 18ms 17 Oct 2023 499th steffan-polygolf 843 60 18ms 14 Feb 2024 499th bzijlema 🇳🇱 843 60 29ms 22 Jul 2024 499th bizy-coder 843 60 18ms 15 Aug 2024 499th keelimeguy 🇺🇸 843 60 19ms 15 May 2025 508th DialFrost 🇸🇬 843 81 24ms 23 Dec 2024 508th fuzzylojik-golf 🇺🇸 843 81 24ms 20 Aug 2025 510th DialFrost 🇸🇬 842 57 95ms 5 days ago 511th m-tkach 🇺🇦 842 87 62ms 22 Nov 2022 511th sean-niemann 🇺🇸 842 87 62ms 7 Feb 2023 513th GrayJoKing 🇦🇺 842 92 28ms 26 Oct 2023 514th dokutan 840 49 52ms 30 Apr 2024 515th MeWhenI 🇻🇦 837 51 707ms 15 Sep 2025 515th dokutan 837 51 676ms 21 days ago 517th Steffan153 🇫🇮 837 56 30ms 9 Feb 2023 517th sean-niemann 🇺🇸 837 56 28ms 2 Aug 2024 519th MeWhenI 🇻🇦 837 64 52ms 9 Apr 2024 520th ovs-code 🇩🇪 835 74 332ms 12 Nov 2023 521st janbehrens 🇩🇪 835 83 420ms 20 Nov 2022 522nd duckyluuk 🇳🇱 833 69 93ms 25 Dec 2024 523rd Yax42 🇫🇷 833 77 458ms 21 Apr 2025 524th primo-ppcg 🇹🇭 833 82 25ms 20 Nov 2022 525th janbehrens 🇩🇪 831 50 360ms 11 Jul 2023 526th dokutan 831 57 361ms 7 Apr 2024 527th emgordon154 831 62 4,090ms 8 Nov 2024 528th lynn 830 31 138ms 16 Oct 2023 529th Eilonlif 🇮🇱 830 61 17ms 9 Dec 2022 529th SirFireball3521 830 61 16ms 9 Mar 2023 529th minhtrancccp 830 61 19ms 11 Jan 2024 529th stertooy 🇧🇪 830 61 17ms 14 Jun 2024 533rd SirBogman 🇺🇸 829 60 41ms 9 Jan 2024 534th GolfingSuccess 🇬🇷 828 29 3ms 25 Feb 2023 534th 5cw 🇺🇸 828 29 5ms 10 Apr 2023 534th codereport 🇨🇦 828 29 3ms 17 May 2024 537th snoozingnewt 🇨🇦 828 100 120ms 25 days ago 538th Ripick 827 69 155ms 8 Jan 2023 538th dokutan 827 69 155ms 31 Dec 2023 538th Yewzir 🇧🇪 827 69 168ms 14 Feb 2024 541st AlephSquirrel 824 50 42ms 7 Mar 2023 541st SirBogman 🇺🇸 824 50 48ms 10 Jan 2024 543rd jared-hughes 823 89 57ms 20 Nov 2022 543rd roupiq 🇵🇱 823 89 60ms 3 Jan 2024 543rd Herbert00709 🇵🇱 823 89 62ms 7 Jun 2024 543rd DialFrost 🇸🇬 823 89 64ms 17 Jun 2024 543rd KasperKivimaeki 🇫🇮 823 89 60ms 16 days ago 548th DialFrost 🇸🇬 820 139 1,670ms 13 Sep 2025 549th KatieLG 🇬🇧 816 62 16ms 26 Nov 2022 549th suwat513 816 62 17ms 6 Dec 2022 549th StefanHabel 🇨🇦 816 62 19ms 19 Dec 2022 549th Ripick 816 62 23ms 1 Feb 2023 549th quimey 816 62 17ms 8 Mar 2023 549th firegene 🇮🇪 816 62 16ms 2 Apr 2023 549th yzhs 🇩🇪 816 62 23ms 23 Jun 2023 549th Andriamanitra 🇫🇮 816 62 17ms 17 Jul 2023 549th Re-Adventures 🇮🇳 816 62 18ms 20 Jul 2023 549th fkantelberg 816 62 17ms 12 Aug 2023 549th Mikey-Beep 🇬🇧 816 62 16ms 23 Aug 2023 549th htareque 816 62 16ms 13 Oct 2023 First Prev 481–560 of 1,818 Next Last