Smallest n-digit number ending in n.

Terms

a(0) =1a(1) =12a(2) =103a(3) =1004a(4) =10005a(5) =100006a(6) =1000007a(7) =10000008a(8) =100000009a(9) =1000000010a(10) =10000000011a(11) =100000000012