A044241 Numbers n such that string 6,6 occurs in the base 8 representation of n but not of n-1.

54, 118, 182, 246, 310, 374, 432, 502, 566, 630, 694, 758, 822, 886, 944, 1014, 1078, 1142, 1206, 1270, 1334, 1398, 1456, 1526, 1590, 1654, 1718, 1782, 1846, 1910, 1968, 2038, 2102, 2166, 2230, 2294, 2358, 2422, 2480, 2550