Numbers n such that string 7,0 occurs in the base 9 representation of n but not of n-1.

Terms

a(0) =63a(1) =144a(2) =225a(3) =306a(4) =387a(5) =468a(6) =549a(7) =567a(8) =630a(9) =711a(10) =792a(11) =873a(12) =954a(13) =1035a(14) =1116a(15) =1197a(16) =1278a(17) =1296a(18) =1359a(19) =1440a(20) =1521a(21) =1602a(22) =1683a(23) =1764a(24) =1845a(25) =1926a(26) =2007a(27) =2025a(28) =2088a(29) =2169