A044239 Numbers n such that string 6,4 occurs in the base 8 representation of n but not of n-1.

52, 116, 180, 244, 308, 372, 416, 436, 500, 564, 628, 692, 756, 820, 884, 928, 948, 1012, 1076, 1140, 1204, 1268, 1332, 1396, 1440, 1460, 1524, 1588, 1652, 1716, 1780, 1844, 1908, 1952, 1972, 2036, 2100, 2164, 2228, 2292, 2356