The 4th drive strikes again :george:
271*2^322971-1 (97227 digits)

265*2^323083-1 (97261 digits)

Almost 100,000 digits from the 4th drive:
215*2^331784-1 (99880 digits)

And from the 4th drive:

271*2^342349-1 (103060 digits)

Another one from the 4th drive:

241*2^336197-1 (101208 digits)

And one more :cool:

259*2^347159-1 (104508 digits)

880923615*2^277389-1 (83512 digits)

From the 4th Drive:

217*2^327829-1 (98689 digits)

12345*2^450486-1 (135614 digits)
12345*2^454194-1 (136731 digits)

Found two of reasonable size, k<300 :george:

[B]73*2^783831-1 [/B](235959 digits)
[B]177*2^653686-1 [/B](196782 digits)

From the 4th drive:
217*2^377581-1 (113666 digits)