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

Terms

a(0) =7a(1) =19a(2) =37a(3) =53a(4) =71a(5) =89a(6) =107a(7) =131a(8) =151a(9) =173a(10) =193a(11) =223a(12) =239a(13) =263a(14) =281a(15) =311a(16) =337a(17) =359a(18) =383a(19) =409a(20) =433a(21) =457a(22) =479a(23) =503a(24) =541a(25) =569a(26) =593a(27) =613a(28) =641a(29) =659