Primes of the form (3^n + 5^n)/2.

[Hugo Pfoertner]

zak seidov wrote:
> 
> Not appeared in OEIS:
> 
> %S A000001 17, 353, 198593
> %N A000001 Primes of the form (3^n + 5^n)/2.
> %C A000001 Corresponding n's are 2^1, 2^2, and 2^3.
> What are next terms?
> Cf. A074606 3^n + 5^n.
> %A A000001 Zak Seidov, Aug 27 2006
> 
> My kind request to gurus:
> What are next terms?
> Thanks, Zak

If any more should exist, they are > (3^2500+5^2500)/2

Hugo