Primes of the form 2^n + 45.

Terms

a(0) =47a(1) =53a(2) =61a(3) =109a(4) =173a(5) =557a(6) =1069a(7) =8237a(8) =65581a(9) =134217773a(10) =2147483693a(11) =549755813933