Primes of the form 6*p + 1 where p is also prime.

Terms

a(0) =13a(1) =19a(2) =31a(3) =43a(4) =67a(5) =79a(6) =103a(7) =139a(8) =223a(9) =283a(10) =367a(11) =439a(12) =499a(13) =607a(14) =619a(15) =643a(16) =787a(17) =823a(18) =907a(19) =1039a(20) =1087a(21) =1399a(22) =1447a(23) =1543a(24) =1579a(25) =1627a(26) =1663a(27) =1699a(28) =1759a(29) =1867