7058*10^23216 - 1 may be prime. (a = 2)

7058*10^23216 - 1 is prime! (P = 5, Q = -1) [23220 digits]


The primality of this number, of
the form k*b^n - 1, was proved by computing a Lucas sequence.
The result is verified by computing another independent Lucas sequence.
See
http://en.wikipedia.org/wiki/Lucas_sequence