A044788 Numbers n such that string 7,5 occurs in the base 10 representation of n but not of n+1.

75, 175, 275, 375, 475, 575, 675, 759, 775, 875, 975, 1075, 1175, 1275, 1375, 1475, 1575, 1675, 1759, 1775, 1875, 1975, 2075, 2175, 2275, 2375, 2475, 2575, 2675, 2759, 2775, 2875, 2975, 3075, 3175, 3275, 3375, 3475, 3575