[RC5] You can always do ECM..

Alexander Kruppa alexander.kruppa at stud.tu-muenchen.de
Mon Aug 31 15:34:51 EDT 1998


Hi,

to all those who want a break from RC5 but shy back from starting to
work on a GIMPS Lucas-Lehmer test that will take weeks, please have a
look at http://www.mersenne.org/ecm.htm
Its the page for ECM factoring "small" (<~1800 decimal digits) Mersenne
composite numbers. Running one ECM curve takes anywhere between 5
minutes and a few hours (depending on the bound value you choose), and
each curve is completely independent of all the others. You can join and
leave any time.
Also, it seems the hunt for finding the first 50 digit factor by ECM is
on now: M727 and M641 have been factored far enough to suggent that a 50
digit factor waits to be unveiled. There is no prize connected to this,
but your name might show up in a lot of articles on computer numerics...
:)

Oh, and please remember to report the curves you ran, even if you don´t
find a factor, so people will know when it is time to continue with the
next higher bound value.

Ciao,
  Alex.

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