Primes that remain prime through 2 iterations of function f(x) = 4x + 3.

Terms

a(0) =2a(1) =7a(2) =11a(3) =37a(4) =67a(5) =89a(6) =109a(7) =149a(8) =179a(9) =257a(10) =439a(11) =467a(12) =571a(13) =677a(14) =691a(15) =719a(16) =929a(17) =977a(18) =1019a(19) =1279a(20) =1381a(21) =1447a(22) =1549a(23) =1567a(24) =1747a(25) =1787a(26) =1901a(27) =1931a(28) =2111a(29) =2161