a(n) = prime(9n-1).

Terms

a(0) =19a(1) =59a(2) =101a(3) =149a(4) =193a(5) =241a(6) =293a(7) =353a(8) =409a(9) =461a(10) =521a(11) =587a(12) =641a(13) =691a(14) =757a(15) =823a(16) =881a(17) =947a(18) =1013a(19) =1063a(20) =1123a(21) =1201a(22) =1277a(23) =1319a(24) =1423a(25) =1471a(26) =1531a(27) =1597a(28) =1657a(29) =1723