Bruce Dodson has found an incredible 57 digit factor of M997 using prime95's ECM. This is two digits longer than the previous longest factor found using the ECM method.
Here's the output from prime95:
ECM found a factor in curve #14, stage #2 Sigma=6329517009540700, B1=44000000, B2=4290000000. UID: bd1024tmp, M997 has a factor: 167560816514084819488737767976263150405095191554732902607 Cofactor is a probable prime!
Congratulations to Bruce on this improbable discovery!
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