a(n) = 9*n + 4.

Terms

a(0) =4a(1) =13a(2) =22a(3) =31a(4) =40a(5) =49a(6) =58a(7) =67a(8) =76a(9) =85a(10) =94a(11) =103a(12) =112a(13) =121a(14) =130a(15) =139a(16) =148a(17) =157a(18) =166a(19) =175a(20) =184a(21) =193a(22) =202a(23) =211a(24) =220a(25) =229a(26) =238a(27) =247a(28) =256a(29) =265