A044584 Numbers n such that string 2,0 occurs in the base 8 representation of n but not of n+1.

16, 80, 135, 144, 208, 272, 336, 400, 464, 528, 592, 647, 656, 720, 784, 848, 912, 976, 1087, 1104, 1159, 1168, 1232, 1296, 1360, 1424, 1488, 1552, 1616, 1671, 1680, 1744, 1808, 1872, 1936, 2000, 2064, 2128, 2183, 2192, 2256