Primes that remain prime through 2 iterations of function f(x) = 6x + 5.

Terms

a(0) =2a(1) =11a(2) =13a(3) =17a(4) =31a(5) =37a(6) =41a(7) =43a(8) =71a(9) =73a(10) =79a(11) =83a(12) =97a(13) =137a(14) =139a(15) =151a(16) =163a(17) =181a(18) =191a(19) =193a(20) =197a(21) =269a(22) =277a(23) =307a(24) =317a(25) =347a(26) =373a(27) =409a(28) =431a(29) =503