1515*2^430504-1 (129598 digits)

From k<300

199*2^332985-1 (100241 digits)

From the 4th Drive:

257*2^541402-1 (162981 digits)

At last:

35*2^634402-1 (190976 digits)

Flatlander
 

Congrats on a nice prime, and your new personal record! :cool:

From k<300 :cool:

285*2^376840-1 (113443 digits)

3645*2^470421-1 (141615 digits)

25*2^942563-1 (283742 digits)

Guacamole! That's a big prime.
-Curtis

Cruelty, congrats on a nice prime! :cool:

The third one from k=25 with more than half a million binary bits: 587585, 716769, and now 942563. :surprised

Thanks! I am systematically approaching the 1-megabit barrier :showoff: