Quote:
Originally Posted by Jens K Andersen

There are no primes in this sequence, since 32^n1 = (2^n1) * (16^n+8^n+4^n+2^n+1), and since the two factors are both >31 for n>5 ((32^n1)/31 is not prime for all 1<=n<=5), thus the factorization is not trivial.