Primes of the form 2^r * 13^s + 1.

Terms

a(0) =2a(1) =3a(2) =5a(3) =17a(4) =53a(5) =257a(6) =677a(7) =3329a(8) =13313a(9) =35153a(10) =65537a(11) =2768897a(12) =13631489a(13) =2303721473a(14) =3489660929a(15) =4942652417a(16) =11341398017