a(n) = prime(5*n - 2).

Terms

a(0) =5a(1) =19a(2) =41a(3) =61a(4) =83a(5) =107a(6) =137a(7) =163a(8) =191a(9) =223a(10) =241a(11) =271a(12) =307a(13) =337a(14) =367a(15) =397a(16) =431a(17) =457a(18) =487a(19) =521a(20) =563a(21) =593a(22) =617a(23) =647a(24) =677a(25) =719a(26) =751a(27) =787a(28) =823a(29) =857