Case 1:
xy = z
z/7/11/13 = y
Case 2:
z/3/7/13/37 = y
Case 3:
z/73/137 = y
x=1001
case 1: x=1001
case 2: x=10101
case 3: x=10001
yep
Case 1:
xy = z
z/7/11/13 = y
Case 2:
xy = z
z/3/7/13/37 = y
Case 3:
xy = z
z/73/137 = y