Primes that remain prime through 2 iterations of function f(x) = 6x + 7.

Terms

a(0) =5a(1) =17a(2) =29a(3) =37a(4) =89a(5) =127a(6) =199a(7) =229a(8) =269a(9) =347a(10) =359a(11) =379a(12) =397a(13) =499a(14) =769a(15) =809a(16) =929a(17) =947a(18) =977a(19) =1049a(20) =1087a(21) =1129a(22) =1277a(23) =1279a(24) =1367a(25) =1409a(26) =1439a(27) =1489a(28) =1499a(29) =1607