a(n) = prime(5*n-4).

Terms

a(0) =2a(1) =13a(2) =31a(3) =53a(4) =73a(5) =101a(6) =127a(7) =151a(8) =179a(9) =199a(10) =233a(11) =263a(12) =283a(13) =317a(14) =353a(15) =383a(16) =419a(17) =443a(18) =467a(19) =503a(20) =547a(21) =577a(22) =607a(23) =641a(24) =661a(25) =701a(26) =739a(27) =769a(28) =811a(29) =839