A044233 Numbers n such that string 5,6 occurs in the base 8 representation of n but not of n-1.

46, 110, 174, 238, 302, 366, 368, 430, 494, 558, 622, 686, 750, 814, 878, 880, 942, 1006, 1070, 1134, 1198, 1262, 1326, 1390, 1392, 1454, 1518, 1582, 1646, 1710, 1774, 1838, 1902, 1904, 1966, 2030, 2094, 2158, 2222, 2286, 2350