Originally posted by hc_grove
Well, it seems that I have some special gift for finding really large factors, I just got this one:
5767642985639413495402269732331|28433*2^9985657+1

It's only 31 digits and thus only comes third among my factors in size, but it still 5 digits more than MikeH's largest, which is now number four on the list of large factors (for n>10000 - if we only consider n>100000, MikeH is still in fourth place but a digit further behind).

And I still don't have Java on this machine, so I can't use the online ECM factoring thing for factoring p (to see if it's prime) or p-1 (to see how smooth it is).
Congrats again ... you do have a certain nack for these factors.

As with the others this one is also not prime though ... the Alpatrons jave applet took some time to find this (1 minute 38 seconds), it came out with:

5 767642 985639 413495 402269 732331 = 1255 267090 431443 x 4594 753602 324617