There are no primes of the form A174881(k)1.
There are no further terms through ((40*(40+1))^40) + 1 = 52330005981567385600000001 * 7498996269037701079813541255115132352481561590213553612395236504891175431182405289081378432614400.
Contribution from Farideh Firoozbakht, Apr 22 2010: (Start)
Each term is of the form (4^n+2^n)^2^n+1. Next term (if it exists) is
greater than (4^15+2^15)^2^15, so it has more than 295924 digits. (End)
