The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
Niven Numbers in Python 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 526th GulgDev 721 61 9ms 22 Mar 2023 526th Hortaros 721 61 10ms 15 Apr 2023 526th tobeannouncd 721 61 9ms 18 Sep 2023 526th HumanoidCPU 721 61 9ms 26 Apr 2024 526th HenryFoss-10 721 61 9ms 6 May 2024 526th luca1339 721 61 9ms 29 May 2024 526th jameswmccarty 721 61 9ms 15 Jun 2024 526th wilhelmines 721 61 9ms 17 Jun 2024 526th OrangeBacon 721 61 9ms 12 Aug 2024 526th FernSchoenberg 721 61 10ms 14 Oct 2024 526th ihatethefrench 721 61 9ms 4 Jan 2025 526th EnisEfe0 721 61 10ms 18 May 2025 526th robin-scragg 721 61 10ms 22 May 2025 574th estomagordo 🇳🇱 710 62 9ms 3 Aug 2019 574th cellobix 710 62 9ms 13 Aug 2019 574th adoxography 710 62 12ms 10 Oct 2019 574th RobertPoienar 710 62 9ms 18 Oct 2019 574th Lemonfrostt 710 62 9ms 14 Dec 2019 574th Randomness74 710 62 9ms 14 Mar 2020 574th clementblaudeau 710 62 13ms 28 May 2021 574th hymanimy 710 62 9ms 24 Aug 2021 574th JuliaSzulc 710 62 10ms 15 Mar 2022 574th PATTRIM 710 62 9ms 5 Jan 2023 574th NDR0216 🇹🇼 710 62 9ms 13 Feb 2023 574th Edjyzod 710 62 9ms 7 Mar 2023 574th qwjhvbxi 710 62 9ms 9 Feb 2024 574th Andrey2001 710 62 19ms 10 days ago 588th ArturLange 698 63 14ms 5 Sep 2018 588th suchwise 698 63 9ms 30 Oct 2019 588th hyphz 698 63 9ms 15 Jan 2020 588th 130N35 698 63 9ms 27 Jan 2020 588th valgardg 🇮🇸 698 63 10ms 13 Aug 2021 588th mokymok 🇺🇸 698 63 10ms 23 Nov 2021 588th ellieoverwood 698 63 9ms 29 Dec 2021 588th bwenstar 698 63 9ms 11 Aug 2022 588th mbittner20 698 63 9ms 27 May 2023 588th cingulataluke 698 63 9ms 29 Aug 2023 588th suhren 698 63 9ms 1 Oct 2023 588th VictorStenvers 🇳🇱 698 63 9ms 2 May 2024 588th Schreipfelerer 698 63 9ms 11 Sep 2024 588th TheZwierzLF 🇵🇱 698 63 10ms 19 May 2025 602nd Sticky-Bits 688 64 9ms 26 Apr 2019 602nd derekthatcher 688 64 15ms 22 Sep 2020 602nd joe0400 688 64 9ms 7 Sep 2021 602nd tetraxile 688 64 9ms 3 Oct 2021 602nd BrenSchaap 688 64 9ms 20 Oct 2021 602nd dillon-duncando 688 64 9ms 24 Dec 2021 602nd raketexyz 688 64 10ms 29 Dec 2021 602nd CuboidRaptor 🇨🇦 688 64 10ms 19 Jan 2022 602nd james-downey 688 64 9ms 14 Jul 2022 602nd a-penton 688 64 9ms 22 Sep 2022 602nd eshilo-draper 688 64 9ms 8 Oct 2022 602nd AodhanDalton 688 64 10ms 24 Oct 2022 602nd Ythaenagor 688 64 9ms 5 Aug 2024 602nd Deedogg 688 64 9ms 9 Sep 2024 602nd Apzyte-Gamer 688 64 15ms 2 Nov 2024 602nd theonetruenerd 688 64 9ms 9 Jun 2025 602nd jm600 688 64 9ms 25 Aug 2025 619th ari-gutierrez 677 65 9ms 22 Oct 2018 619th SurplusSineWaves 677 65 9ms 21 Jan 2019 619th evanrittner 677 65 9ms 11 Mar 2019 619th alangodfrey 677 65 9ms 12 Jun 2019 619th TrAyZeN 677 65 10ms 12 Mar 2020 619th febiw 677 65 9ms 22 Mar 2020 619th alexandre-lavoie 677 65 9ms 20 Oct 2020 619th Retkoj 677 65 9ms 30 Nov 2020 619th wrhm 677 65 9ms 12 Dec 2020 619th Manby 677 65 9ms 7 Jul 2021 619th shen-hong-xin 677 65 11ms 7 Jul 2021 619th danielweper 677 65 9ms 21 Oct 2021 619th wirewolf010 677 65 9ms 4 Jan 2022 619th kyleclaassen 677 65 9ms 11 Mar 2022 619th TheSmilingTurtle 677 65 9ms 14 May 2022 619th celiendonze 🇨🇭 677 65 9ms 29 Mar 2023 619th Glinte 677 65 9ms 13 Dec 2023 619th azure-blondon 677 65 16ms 11 May 2024 619th kistlerf 🇨🇭 677 65 16ms 30 May 2025 619th yukii1004 677 65 11ms 25 Sep 2025 639th Threadzless 667 66 13ms 29 Oct 2018 639th patbassing 667 66 9ms 15 Jun 2019 First Prev 561–640 of 909 Next 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