A044247 Numbers n such that string 7,4 occurs in the base 8 representation of n but not of n-1.

60, 124, 188, 252, 316, 380, 444, 480, 508, 572, 636, 700, 764, 828, 892, 956, 992, 1020, 1084, 1148, 1212, 1276, 1340, 1404, 1468, 1504, 1532, 1596, 1660, 1724, 1788, 1852, 1916, 1980, 2016, 2044, 2108, 2172, 2236, 2300, 2364