a(n) = prime(3*n).

Terms

a(0) =5a(1) =13a(2) =23a(3) =37a(4) =47a(5) =61a(6) =73a(7) =89a(8) =103a(9) =113a(10) =137a(11) =151a(12) =167a(13) =181a(14) =197a(15) =223a(16) =233a(17) =251a(18) =269a(19) =281a(20) =307a(21) =317a(22) =347a(23) =359a(24) =379a(25) =397a(26) =419a(27) =433a(28) =449a(29) =463