Add 4, then reverse digits; start with 3.

Terms

a(0) =3a(1) =7a(2) =11a(3) =51a(4) =55a(5) =95a(6) =99a(7) =301a(8) =503a(9) =705a(10) =907a(11) =119a(12) =321a(13) =523a(14) =725a(15) =927a(16) =139a(17) =341a(18) =543a(19) =745a(20) =947a(21) =159a(22) =361a(23) =563a(24) =765a(25) =967a(26) =179a(27) =381a(28) =583a(29) =785