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Old 2003-03-31, 23:49   #2
philmoore
 
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"Phil"
Sep 2002
Tracktown, U.S.A.

3·373 Posts
Default Congratulations to Patrik!

Congratulations to Patrik Johansson, who just yesterday completed the factorization of M731 by finding a 48-digit factor using ECM. According to the ECMNET page:
http://www.loria.fr/~zimmerma/records/ecmnet.html
Patrik did the first stage of ECM using mprime and then did the second stage using GMP-ECM. The 135-digit cofactor is also prime, so this Mersenne number is completely factored. It was the second smallest Mersenne number which had not been completely factored, M713 being the smallest. Patrik just saved the NFSNET people a lot of work - give him points for conservation of cycles!
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