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fermatslibrary's profile
Fermat's Library
Fermat's Library
Fermat's Library
@fermatslibrary

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Fermat's Library

@fermatslibrary

A platform for illuminating academic papers. We publish an annotated paper every week. Our chrome extension for arXiv: https://fermatslibrary.com/librarian 

fermatslibrary.com
Joined September 2015

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    Fermat's Library‏ @fermatslibrary Feb 12
    • Report Tweet
    • Report NetzDG Violation

    Any number dialed in a rectangular shape on a calculator numpad is a multiple of 11pic.twitter.com/RChNIjb8Mu

    5:21 AM - 12 Feb 2020
    • 840 Retweets
    • 3,855 Likes
    • tyler J Hari Mvs Sanjay IAM Sumit Göksel ÜÇER Apple S. Curly Rosé~ ➡️⬇️↘️ ☭
    34 replies 840 retweets 3,855 likes
      1. New conversation
      2. Tom Kane‏ @tomkane85 Feb 12
        • Report Tweet
        • Report NetzDG Violation
        Replying to @fermatslibrary

        A square shape, you mean? E.g. 236,985 is not divisible by 11.

        3 replies 0 retweets 23 likes
      3. Defil1998‏ @brunodefilippo Feb 12
        • Report Tweet
        • Report NetzDG Violation
        Replying to @tomkane85 @fermatslibrary

        Rectangles work too, but you need to use only their vertices, so it's always 4 numbers; your example would work if you consider 2398.

        2 replies 0 retweets 29 likes
      4. 3 more replies
      1. New conversation
      2. Curt infj-T‏ @CurtINFJT Feb 12
        • Report Tweet
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        Replying to @fermatslibrary

        You mean thaaaat's what those things are for?pic.twitter.com/snuZt7onVY

        1 reply 0 retweets 10 likes
      3. (un)Civil Defense‏ @realBuzzerMan Feb 12
        • Report Tweet
        • Report NetzDG Violation
        Replying to @CurtINFJT @fermatslibrary

        That kid looks like he discovered that all by himself --- which is the way I felt when I did it in 1973 on my first LED display calculator. But I used 5-9-0-0-9.

        0 replies 0 retweets 4 likes
      4. End of conversation
      1. New conversation
      2. Medical Research Collaborative, LLC‏ @MedResCol Feb 12
        • Report Tweet
        • Report NetzDG Violation
        Replying to @fermatslibrary

        Square not rectangle. But yeah, that’s awesome.

        2 replies 0 retweets 3 likes
      3. RustyNova‏ @rustynova016 Feb 12
        • Report Tweet
        • Report NetzDG Violation
        Replying to @MedResCol @fermatslibrary

        RustyNova Retweeted Defil1998

        https://twitter.com/brunodefilippo/status/1227590677535641600?s=19 …

        RustyNova added,

        Defil1998 @brunodefilippo
        Replying to @tomkane85 @fermatslibrary
        Rectangles work too, but you need to use only their vertices, so it's always 4 numbers; your example would work if you consider 2398.
        0 replies 0 retweets 6 likes
      4. End of conversation
      1. New conversation
      2. Roger Sauer‏ @rsauer3473 Feb 12
        • Report Tweet
        • Report NetzDG Violation
        Replying to @fermatslibrary

        Before calculators were invented this was done on fingers. And before fingers were invented, cilia worked just fine.pic.twitter.com/ePWOj7YWlj

        1 reply 0 retweets 7 likes
      3. Snows Mann‏ @snowsmann Feb 12
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        Replying to @rsauer3473 @fermatslibrary

        And before cilia, mitochondrial cells with some basic representations of information worked just fine.

        0 replies 0 retweets 0 likes
      4. End of conversation
      1. Thomas Sierink‏ @_Thomas_S_ Feb 12
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        It's 1254 that is though. And so is 2541 etc

        0 replies 0 retweets 3 likes
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      1. Sudarshan Pradhan‏ @sanpradhn Feb 13
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        Replying to @fermatslibrary

        If you use 6 digits in this fashion, those numbers are divisible by 111. If you use all 8, those are divisible by 1111, and sum of the digits is always 40, so then differences of such numbers are divisible by 9999.

        0 replies 0 retweets 2 likes
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