a(n) = prime(4*n - 2).

Terms

a(0) =3a(1) =13a(2) =29a(3) =43a(4) =61a(5) =79a(6) =101a(7) =113a(8) =139a(9) =163a(10) =181a(11) =199a(12) =229a(13) =251a(14) =271a(15) =293a(16) =317a(17) =349a(18) =373a(19) =397a(20) =421a(21) =443a(22) =463a(23) =491a(24) =521a(25) =557a(26) =577a(27) =601a(28) =619a(29) =647