a(n) = 5*n + 4.

Terms

a(0) =4a(1) =9a(2) =14a(3) =19a(4) =24a(5) =29a(6) =34a(7) =39a(8) =44a(9) =49a(10) =54a(11) =59a(12) =64a(13) =69a(14) =74a(15) =79a(16) =84a(17) =89a(18) =94a(19) =99a(20) =104a(21) =109a(22) =114a(23) =119a(24) =124a(25) =129a(26) =134a(27) =139a(28) =144a(29) =149