The numbers 3, 5, and 7 are factors of n. Find four
other factors of n besides 1.
The smallest n could be to have those three factors is
n = 3×5×7 = 105
Some factors of 3×5×7 besides 1, 3, 5, and 7 are
3×5, 3×7, 5×7 and 3×5×7, that is
15, 21, 35, and 105
Edwin