A044778 Numbers n such that string 6,5 occurs in the base 10 representation of n but not of n+1.

65, 165, 265, 365, 465, 565, 659, 665, 765, 865, 965, 1065, 1165, 1265, 1365, 1465, 1565, 1659, 1665, 1765, 1865, 1965, 2065, 2165, 2265, 2365, 2465, 2565, 2659, 2665, 2765, 2865, 2965, 3065, 3165, 3265, 3365, 3465, 3565