From Choose your own K

850612425*2^219429-1 (66064 digits) :banana:

80555475*2^217568-1 (65503 digits)

woohoo!

3276742755*2^253106-1 is prime! :showoff:

Dr. Mike...

918332415*2^248917-1 is also prime, 74941 digits.

The 30th prime in the RPS drive!

3338480145*2^402979-1 (121319 digits)

Nice prime Larry, congrats! :cool:

Thanks. This k had *10* primes for the range n=200k-300k so I had
high hopes. However, only 1 prime has shown up in the n=300k-400k
range (which is 80% done).

210885*2^549843-1 (165525 digits) - finally!!! :banana: :banana: :banana:

From the RPS drive:

1694614845*2^253946-1, 76455 digits

869688105*2^342019-1 (102967 digits)

869688105*2^379559-1 (114268 digits)