Class 4- primes (for definition see A005109).

Terms

a(0) =47a(1) =139a(2) =167a(3) =179a(4) =269a(5) =277a(6) =347a(7) =461a(8) =467a(9) =499a(10) =599a(11) =643a(12) =691a(13) =709a(14) =797a(15) =827a(16) =829a(17) =839a(18) =857a(19) =863a(20) =967a(21) =997a(22) =1013a(23) =1019a(24) =1039a(25) =1063a(26) =1069a(27) =1151a(28) =1163a(29) =1181