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 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 801st Alex-x90 🇺🇸 713 62 12ms 14 Jan 2023 801st m-tkach 🇺🇦 713 62 13ms 20 Mar 2023 801st emgordon154 713 62 12ms 19 Mar 2025 801st Yax42 🇫🇷 713 62 11ms 6 Sep 2025 805th emgordon154 711 95 531ms 28 May 2025 806th primo-ppcg 🇹🇭 710 40 247ms 20 Nov 2022 806th sean-niemann 🇺🇸 710 40 180ms 20 Nov 2022 806th trist224 🇫🇷 710 40 178ms 28 Nov 2022 806th fuzzylojik-golf 🇺🇸 710 40 191ms 21 Aug 2025 810th brimstonetrader 710 87 282ms 24 Dec 2023 811th jhpaques 🇫🇷 709 70 18ms 30 Nov 2022 811th michelebastione 🇮🇹 709 70 17ms 7 Dec 2022 811th Skwerl23 709 70 22ms 5 Feb 2023 811th celiendonze 🇨🇭 709 70 17ms 21 Apr 2023 811th epic-programmer-guy 709 70 17ms 20 Dec 2023 811th Stockoh 🇫🇷 709 70 267ms 24 Apr 2024 811th CutSandstone 709 70 16ms 5 Jul 2024 811th Andrey135296 709 70 16ms 25 Oct 2024 811th Emutis 🇱🇹 709 70 19ms 27 Oct 2024 820th sean-niemann 🇺🇸 709 87 46ms 21 Apr 2023 821st Yewzir 🇧🇪 709 122 268ms 12 Feb 2024 822nd Irratix 🇳🇱 706 75 4ms 14 Jan 2023 822nd Vinterion 706 75 4ms 19 Jul 2024 824th janbehrens 🇩🇪 703 90 364ms 17 Apr 2025 825th MeWhenI 🇻🇦 703 123 274ms 9 Apr 2024 826th Shanethegamer 🇺🇸 702 82 133ms 22 Nov 2022 826th snoozingnewt 🇨🇦 702 82 119ms 13 Oct 2025 828th yzhs 🇩🇪 702 88 195ms 26 Jun 2023 829th CheeseCake628 🇳🇴 701 65 397ms 18 Oct 2025 830th Yewzir 🇧🇪 701 80 100ms 12 Feb 2024 831st Steffan153 🇫🇮 700 66 20ms 14 Feb 2024 832nd dokutan 700 71 43ms 18 Nov 2025 833rd Fishron 699 71 17ms 29 Nov 2022 833rd Jacob385 699 71 19ms 18 Apr 2024 833rd wobblybits 699 71 19ms 29 Aug 2025 836th RYNO8 697 76 3ms 20 Aug 2023 837th msbranicky 697 124 272ms 3 Oct 2023 838th msbranicky 697 161 1,703ms 16 Sep 2025 839th Shanethegamer 🇺🇸 696 77 55ms 30 Nov 2022 840th CaedenHarper 🇨🇦 695 99 513ms 3 Oct 2025 841st Shanethegamer 🇺🇸 693 41 160ms 19 Nov 2022 841st prplz 🇦🇺 693 41 208ms 19 Nov 2022 841st scpchicken 🇵🇼 693 41 189ms 20 Nov 2022 841st MeWhenI 🇻🇦 693 41 165ms 30 Jan 2023 841st Yewzir 🇧🇪 693 41 258ms 14 Feb 2024 846th msbranicky 693 60 350ms 15 Jan 2024 847th Florian-Mt 692 99 131ms 12 Jul 2024 848th tatzyr 🇯🇵 691 57 52ms 26 Mar 2025 849th voytxt 🇨🇿 691 64 15ms 21 Jul 2023 850th JunkIce 690 66 377ms 3 Dec 2024 851st mbittner20 690 72 17ms 27 May 2023 851st eiburns 690 72 19ms 27 Oct 2023 851st wh3n3v3r 🇨🇿 690 72 29ms 13 Nov 2024 851st WillowWispy 690 72 17ms 14 Mar 2025 855th MeWhenI 🇻🇦 688 92 385ms 19 Jun 2025 856th inventshah 685 64 137ms 4 Aug 2024 857th prplz 🇦🇺 685 113 30ms 31 Dec 2022 858th steffan-polygolf 684 77 80ms 24 Feb 2023 859th Codsilla 🇨🇦 681 61 323ms 3 Nov 2023 860th Yewzir 🇧🇪 681 73 40ms 24 Feb 2024 861st weliveinhell 🇭🇹 680 65 12ms 15 Sep 2023 861st dylanarmstrong 680 65 12ms 25 Jan 2024 861st Yewzir 🇧🇪 680 65 14ms 12 Feb 2024 864th HumanoidCPU 680 67 361ms 19 Feb 2025 865th Yewzir 🇧🇪 680 69 8ms 13 Feb 2024 866th snoozingnewt 🇨🇦 679 52 4ms 9 Oct 2025 867th 4hg 🇺🇸 679 58 54ms 11 Dec 2022 867th csharpython 679 58 49ms 5 Aug 2025 869th MeWhenI 🇻🇦 679 77 94ms 9 Apr 2024 870th MeWhenI 🇻🇦 679 78 4ms 9 Apr 2024 871st msbranicky 678 76 4,249ms 6 Jan 2025 872nd AlephSquirrel 678 97 6ms 5 Aug 2024 873rd angel-p57 🇯🇵 678 215 291ms 11 Dec 2023 874th MeWhenI 🇻🇦 678 245 448ms 19 Apr 2025 875th retrohun 676 42 168ms 30 Dec 2022 875th neel11235813 676 42 192ms 3 Feb 2023 877th MeWhenI 🇻🇦 676 100 434ms 9 Apr 2024 878th CaedenHarper 🇨🇦 675 128 244ms 5 Oct 2025 879th emgordon154 674 87 34ms 19 Mar 2025 880th annaproxy 673 94 356ms 22 Oct 2023 First Prev 801–880 of 1,802 Next Last