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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 31 Aug 2017
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    -Take any 4 No (at least 2 ≠ digits) -Arrange the digits in ⬇️ and then in ⬆order -Do bigger-smaller Reaches 6174, in at most 7 iterations!pic.twitter.com/i0OfRVgMYo

    9:00 AM - 31 Aug 2017
    • 226 Retweets
    • 609 Likes
    • Juan Venturello MCVIII Stefan log0 M A Y O R A Sean Smith pyahska fm13 Deborah
    23 replies 226 retweets 609 likes
      1. New conversation
      2. axs‏ @_axs_ 31 Aug 2017
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        Replying to @fermatslibrary

        Mysterious number 6174 via @ma85003https://goo.gl/yGGJtK 

        1 reply 2 retweets 5 likes
      3. Little Ozzy‏ @36_prot 11 Dec 2017
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        Replying to @_axs_ @fermatslibrary @ma85003

        very.

        0 replies 0 retweets 0 likes
      4. End of conversation
      1. Collin Olson‏ @Oly66Olson 31 Aug 2017
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        Replying to @fermatslibrary

        Can this be proven elegantly? I suppose brute force is one way, but how else?

        0 replies 0 retweets 7 likes
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      1. DℝOℕ∈‏ @d_r_o_n_e 31 Aug 2017
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        Replying to @fermatslibrary

        When subtract two 4digit numbers (ascending - descending) you get 3087 and 6174 = 3087*2 [nn-1n-2n-3] - [n-3n-2n-1n] = 3087 For example:pic.twitter.com/x8QV9Q6jjd

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      1. Rabin Patra‏ @rabinpatra 31 Aug 2017
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        Replying to @fermatslibrary

        I was fascinated when I first read about these numbers and the man who found them -- Kaprekar's constant https://goo.gl/3qoVMu 

        0 replies 1 retweet 4 likes
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      1.  💼 ✈️ 👥 😤 🤧 🛬 🤢 🚑 🏨 🩺 😷 👨‍🔬 🙏 💉 🥵 👩‍⚕️ 👩‍⚕️ 😣 ☠️ ⚰️‏ @llaWttaM 31 Aug 2017
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        Replying to @fermatslibrary

        Thanks a lot, now I have to change my PIN.

        0 replies 0 retweets 6 likes
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      1. New conversation
      2. Arnaud‏ @ltearno 31 Aug 2017
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        Replying to @fermatslibrary

        The proof please! Thanks!

        1 reply 0 retweets 0 likes
      3. Aranđel Šarenac‏ @NotSharpest 1 Sep 2017
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        Replying to @ltearno @fermatslibrary

        https://upload.wikimedia.org/wikipedia/commons/thumb/4/4f/KaprekarRoutineFlowGraph6174.svg/770px-KaprekarRoutineFlowGraph6174.svg.png …

        1 reply 1 retweet 1 like
      4. 1 more reply
      1. NaranderanRam‏ @NaranderanRam 1 Sep 2017
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        Replying to @fermatslibrary

        Blackhole number

        0 replies 1 retweet 1 like
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      1. • Ana Lua •‏ @AnaLua_07 31 Aug 2017
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        Replying to @fermatslibrary

        Que q é isso Cellbit?

        0 replies 0 retweets 2 likes
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