8th drive:
5865*2^889294-1 (267708 digits)
5865*2^889524-1 (267778 digits)

[QUOTE=sjtjung;251177]31*2^1755317-1 is prime (528405 digits)[/QUOTE]
Congrats on your huge prime!

1215*2^960098-1 (289022 digits)

8th Drive:
9075*2^881939-1 is prime. 265495 digits.

From k<300 [Part II]:
165*2^1036898-1 (312140 digits)

8rh Drive:

7245*2^880345-1 (265015 digits)

4059*2^725479-1 (218395 digits)

1251*2^962729-1 (289814 digits)
1293*2^962742-1 (289818 digits)

4107*2^726056-1 (218569 digits)

8th drive:
9441*2^893751-1 (269050 digits)

1237*2^964437-1 (290328 digits)