A044335 Numbers n such that string 0,3 occurs in the base 10 representation of n but not of n-1.

103, 203, 303, 403, 503, 603, 703, 803, 903, 1003, 1030, 1103, 1203, 1303, 1403, 1503, 1603, 1703, 1803, 1903, 2003, 2030, 2103, 2203, 2303, 2403, 2503, 2603, 2703, 2803, 2903, 3003, 3030, 3103, 3203, 3303, 3403, 3503