A044143 Numbers n such that string 0,5 occurs in the base 7 representation of n but not of n-1.

54, 103, 152, 201, 250, 299, 348, 378, 397, 446, 495, 544, 593, 642, 691, 721, 740, 789, 838, 887, 936, 985, 1034, 1064, 1083, 1132, 1181, 1230, 1279, 1328, 1377, 1407, 1426, 1475, 1524, 1573, 1622, 1671, 1720, 1750, 1769, 1818