a(n) = prime(3n-2).

Terms

a(0) =2a(1) =7a(2) =17a(3) =29a(4) =41a(5) =53a(6) =67a(7) =79a(8) =97a(9) =107a(10) =127a(11) =139a(12) =157a(13) =173a(14) =191a(15) =199a(16) =227a(17) =239a(18) =257a(19) =271a(20) =283a(21) =311a(22) =331a(23) =349a(24) =367a(25) =383a(26) =401a(27) =421a(28) =439a(29) =457