A043243 Numbers n such that 3 and 7 occur juxtaposed in the base 10 representation of n but not of n-1.

37, 73, 137, 173, 237, 273, 337, 370, 437, 473, 537, 573, 637, 673, 730, 773, 837, 873, 937, 973, 1037, 1073, 1137, 1173, 1237, 1273, 1337, 1370, 1437, 1473, 1537, 1573, 1637, 1673, 1730, 1773, 1837, 1873, 1937, 1973, 2037