Adjacent generalized Fermat primes.

Terms

a(0) =3a(1) =3a(2) =3a(3) =75a(4) =113a(5) =2163a(6) =63739a(7) =13221a(8) =54809a(9) =3656571a(10) =6992033a(11) =125441a(12) =103859115a(13) =56414915a(14) =87888967