Primes that remain prime through 5 iterations of function f(x) = 2x + 1.

Terms

a(0) =89a(1) =63419a(2) =127139a(3) =405269a(4) =810809a(5) =1069199a(6) =1122659a(7) =1178609a(8) =1333889a(9) =1598699a(10) =1806089a(11) =1958249a(12) =2164229a(13) =2245319a(14) =2329469a(15) =2606069a(16) =2848949a(17) =3241289a(18) =3339989a(19) =3784199a(20) =3962039a(21) =4088879a(22) =4328459a(23) =4444829a(24) =4658939a(25) =4664249a(26) =4894889a(27) =4897709a(28) =5132999