Numbers n such that string 3,8 occurs in the base 10 representation of n but not of n-1.

Terms

a(0) =38a(1) =138a(2) =238a(3) =338a(4) =380a(5) =438a(6) =538a(7) =638a(8) =738a(9) =838a(10) =938a(11) =1038a(12) =1138a(13) =1238a(14) =1338a(15) =1380a(16) =1438a(17) =1538a(18) =1638a(19) =1738a(20) =1838a(21) =1938a(22) =2038a(23) =2138a(24) =2238a(25) =2338a(26) =2380a(27) =2438a(28) =2538a(29) =2638