a(n) = prime(6*n - 4).

Terms

a(0) =3a(1) =19a(2) =43a(3) =71a(4) =101a(5) =131a(6) =163a(7) =193a(8) =229a(9) =263a(10) =293a(11) =337a(12) =373a(13) =409a(14) =443a(15) =479a(16) =521a(17) =569a(18) =601a(19) =641a(20) =673a(21) =719a(22) =757a(23) =809a(24) =839a(25) =881a(26) =929a(27) =971a(28) =1013a(29) =1049