Quote:
Originally Posted by fivemack
(7^352011)/6 is a base3 pseudoprime.
At 29749 digits it's much too big for ECPP (20562 digits took six K8/2400years, 15071 digits took two Xeon/2600years); 35200 looks splendidly composite, so I suppose I should start hunting cyclotomic factors.

Indeed. The cyclotomic factors will not help ECPP, but they can greatly help
APRCL.