a(n) = prime(6*n).

Terms

a(0) =13a(1) =37a(2) =61a(3) =89a(4) =113a(5) =151a(6) =181a(7) =223a(8) =251a(9) =281a(10) =317a(11) =359a(12) =397a(13) =433a(14) =463a(15) =503a(16) =557a(17) =593a(18) =619a(19) =659a(20) =701a(21) =743a(22) =787a(23) =827a(24) =863a(25) =911a(26) =953a(27) =997a(28) =1033a(29) =1069