A043252 Numbers n such that 5 and 7 occur juxtaposed in the base 10 representation of n but not of n-1.

57, 75, 157, 175, 257, 275, 357, 375, 457, 475, 557, 570, 657, 675, 750, 775, 857, 875, 957, 975, 1057, 1075, 1157, 1175, 1257, 1275, 1357, 1375, 1457, 1475, 1557, 1570, 1657, 1675, 1750, 1775, 1857, 1875, 1957, 1975, 2057