A044207 Numbers n such that string 2,4 occurs in the base 8 representation of n but not of n-1.

20, 84, 148, 160, 212, 276, 340, 404, 468, 532, 596, 660, 672, 724, 788, 852, 916, 980, 1044, 1108, 1172, 1184, 1236, 1280, 1364, 1428, 1492, 1556, 1620, 1684, 1696, 1748, 1812, 1876, 1940, 2004, 2068, 2132, 2196, 2208, 2260