319*2^629783-1 is prime

815*2^658632-1 is prime

next prime for 6k-effort:

333*2^717510-1

only ~7000 after last prime for k=333!

893*2^659586-1 is prime

[QUOTE=MyDogBuster;166415]893*2^659586-1 is prime[/QUOTE]

In the top 10 as our 7th largest and a new PB for you :bow:

[QUOTE]In the top 10 as our 7th largest and a new PB for you :bow: [/QUOTE]

Hopefully by the time we finish Drives 5, 6, & 7 we can have many PB's for everyone. They are getting harder to find in these upper ranges.

325*2^650493-1 is prime

385*2^654349-1 is prime

At last, another prime on the quite barren 5th drive:

563*2^664568-1 is prime

937*2^662181-1 is prime

The extraordinaly long barren range for new primes continues on the 6th drive:

705*2^630007-1 is confirmed prime

No new primes since n=~618K. Bleh.