a(n) = 10^n + 3.

Terms

a(0) =13a(1) =103a(2) =1003a(3) =10003a(4) =100003a(5) =1000003a(6) =10000003a(7) =100000003a(8) =1000000003a(9) =10000000003a(10) =100000000003