Odd primes such that (3p+1)/2 and 3p+4 are also prime.

Terms

a(0) =3a(1) =11a(2) =19a(3) =31a(4) =59a(5) =131a(6) =151a(7) =179a(8) =311a(9) =431a(10) =439a(11) =619a(12) =739a(13) =811a(14) =839a(15) =1039a(16) =1231a(17) =1399a(18) =1531a(19) =1699a(20) =1879a(21) =1951a(22) =2111a(23) =2351a(24) =2411a(25) =2671a(26) =2699a(27) =2719a(28) =2819a(29) =2939