Loading ...
Sorry, an error occurred while loading the content.

Re: Number 19

Expand Messages
  • djbroadhurst
    ... The next probable prime has 25229 digits: (91*10^25229-19)/99 is Fermat and Lucas PRP! (166.8607s+0.0024s) David
    Message 1 of 5 , Sep 10 4:58 AM
    • 0 Attachment
      --- In primenumbers@yahoogroups.com, Ali Adams
      <alipoland@...> wrote:

      > 23 digits 91919191919191919191919 is prime

      The next probable prime has 25229 digits:

      (91*10^25229-19)/99 is Fermat and Lucas PRP! (166.8607s+0.0024s)

      David
    • Lélio Ribeiro de Paula
      ... and was found by Patrick de Geest in july 2004: http://www.primenumbers.net/prptop/searchform.php?form=%3F%2F99 Lélio [Non-text portions of this message
      Message 2 of 5 , Sep 10 5:20 AM
      • 0 Attachment
        >
        > --- In primenumbers@yahoogroups.com, David Broadhurst wrote:
        >
        > > 23 digits 91919191919191919191919 is prime
        >
        > The next probable prime has 25229 digits:
        >
        > (91*10^25229-19)/99 is Fermat and Lucas PRP! (166.8607s+0.0024s)
        >
        > David
        >
        >
        >

        and was found by Patrick de Geest in july 2004:

        http://www.primenumbers.net/prptop/searchform.php?form=%3F%2F99


        Lélio


        [Non-text portions of this message have been removed]
      • Makoto Kamada
        ... According to Patrick de Geest s website, Hans Rosenthal found it. http://www.worldofnumbers.com/undulat.htm#supp919 Factorizations of (91*10^(2n+1)-19)/99
        Message 3 of 5 , Sep 10 6:19 AM
        • 0 Attachment
          On 2010/09/10 21:20, Lélio Ribeiro de Paula wrote:
          >> --- In primenumbers@yahoogroups.com, David Broadhurst wrote:
          >>
          >> The next probable prime has 25229 digits:
          >>
          >> (91*10^25229-19)/99 is Fermat and Lucas PRP! (166.8607s+0.0024s)
          >
          > and was found by Patrick de Geest in july 2004:
          >
          > http://www.primenumbers.net/prptop/searchform.php?form=%3F%2F99

          According to Patrick de Geest's website, Hans Rosenthal found it.
          http://www.worldofnumbers.com/undulat.htm#supp919

          Factorizations of (91*10^(2n+1)-19)/99 are here:
          http://www.asahi-net.or.jp/~kc2h-msm/mathland/aba/aba919.htm

          Makoto Kamada
        • maximilian_hasler
          ... The 15 digit number 151515151515151 is prime, too ; and it is the only such prime (undulating : aba...ba with ab = 10*a+b or ba = 10*b+a digits. M.
          Message 4 of 5 , Sep 10 10:11 AM
          • 0 Attachment
            > 23 digits 91919191919191919191919 is prime
            > 17 digits 91919191919191919 is prime.
            > 11 digits 91919191919 is prime.
            > 9 digits 919191919 is prime.

            The 15 digit number 151515151515151 is prime, too ;
            and it is the only such prime (undulating : aba...ba
            with ab = 10*a+b or ba = 10*b+a digits.

            M.
          Your message has been successfully submitted and would be delivered to recipients shortly.