Originally posted by vjs
Not bad HC... not bad at all. The smoothest factor was found by sieve above post.

But yours certainly ranks in the smoothest I've seen for P-1 thus far.
The smoothest I've found by P-1 is:
268260631411561 | 10223*2^5240741+1
268260631411560=2^3*3*5*101*241*293*463*677

Back in the early days of P-1 mklasson found:
40315798264717 | 21181*2^4031084+1
40315798264716=2^2*3^3*13*211*367*601*617