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First known prime factor of F22

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  • Dario
    Hello folks, David Bessell has found the first known prime factor of F22 = 2^2^22+1. The number is 64658705994591851009055774868504577. The cofactor is
    Message 1 of 3 , Mar 26, 2010
      Hello folks,

      David Bessell has found the first known prime factor of F22 = 2^2^22+1. The number is 64658705994591851009055774868504577. The cofactor is composite. See Mersenneforum at http://www.mersenneforum.org/showthread.php?p=209627 for more details.

      Best regards,

      DarĂ­o Alpern
    • djbroadhurst
      ... Wow! Thanks, Dario, for this update. My dear friend Wilfrid will be rather happy. David
      Message 2 of 3 , Mar 26, 2010
        --- In primenumbers@yahoogroups.com, "Dario" <alpertron@...> wrote:

        > David Bessell has found the first known prime factor of
        > F22 = 2^2^22+1. The number is 64658705994591851009055774868504577.

        Wow! Thanks, Dario, for this update.
        My dear friend Wilfrid will be rather happy.

        David
      • djbroadhurst
        ... Now Wilfrid is doubly happy, since another prime divisor of F12 has been found, with GMP-ECM:
        Message 3 of 3 , Mar 27, 2010
          --- In primenumbers@yahoogroups.com,
          "djbroadhurst" <d.broadhurst@...> wrote:

          > > David Bessell has found the first known prime factor of
          > > F22 = 2^2^22+1. The number is 64658705994591851009055774868504577.
          >
          > Wow! Thanks, Dario, for this update.
          > My dear friend Wilfrid will be rather happy.

          Now Wilfrid is doubly happy, since another prime divisor of F12
          has been found, with GMP-ECM:

          http://www.mersenneforum.org/showthread.php?p=209743#post209743

          David
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