A044312 Numbers n such that string 6,7 occurs in the base 9 representation of n but not of n-1.

61, 142, 223, 304, 385, 466, 547, 549, 628, 709, 790, 871, 952, 1033, 1114, 1195, 1276, 1278, 1357, 1438, 1519, 1600, 1681, 1762, 1843, 1924, 2005, 2007, 2086, 2167, 2248, 2329, 2410, 2491, 2572, 2653, 2734, 2736, 2815