Numbers n such that string 6,5 occurs in the base 10 representation of n but not of n-1.

Terms

a(0) =65a(1) =165a(2) =265a(3) =365a(4) =465a(5) =565a(6) =650a(7) =665a(8) =765a(9) =865a(10) =965a(11) =1065a(12) =1165a(13) =1265a(14) =1365a(15) =1465a(16) =1565a(17) =1650a(18) =1665a(19) =1765a(20) =1865a(21) =1965a(22) =2065a(23) =2165a(24) =2265a(25) =2365a(26) =2465a(27) =2565a(28) =2650a(29) =2665