A044142 Numbers n such that string 0,4 occurs in the base 7 representation of n but not of n-1.

53, 102, 151, 200, 249, 298, 347, 371, 396, 445, 494, 543, 592, 641, 690, 714, 739, 788, 837, 886, 935, 984, 1033, 1057, 1082, 1131, 1180, 1229, 1278, 1327, 1376, 1400, 1425, 1474, 1523, 1572, 1621, 1670, 1719, 1743, 1768, 1817