a(n) = 5*n + 3.

Terms

a(0) =3a(1) =8a(2) =13a(3) =18a(4) =23a(5) =28a(6) =33a(7) =38a(8) =43a(9) =48a(10) =53a(11) =58a(12) =63a(13) =68a(14) =73a(15) =78a(16) =83a(17) =88a(18) =93a(19) =98a(20) =103a(21) =108a(22) =113a(23) =118a(24) =123a(25) =128a(26) =133a(27) =138a(28) =143a(29) =148