Primes that remain prime through 5 iterations of function f(x) = 2x + 3.

Terms

a(0) =47a(1) =67a(2) =1427a(3) =6047a(4) =12097a(5) =16057a(6) =44507a(7) =76537a(8) =92387a(9) =100057a(10) =132707a(11) =209647a(12) =263387a(13) =354247a(14) =407947a(15) =465407a(16) =477727a(17) =507757a(18) =775237a(19) =787477a(20) =788687a(21) =865327a(22) =907367a(23) =955457a(24) =1015517a(25) =1121387a(26) =1178197a(27) =1302277a(28) =1360367a(29) =1524247