Some positive integers have exactly four positive factors. For example, 35 has only 1, 5, 7 and 35 as its factors. What is the sum of the smallest five positive integers that each have exactly four positive factors?
The positive integers with exactly four positive factors can be written in the form $pq$, where $p$ and $q$ are distinct prime numbers, or $p^3$, where $p$ is a prime number.

Using this, we can see that the smallest five positive integers with exactly four positive factors are $2\cdot 3 = 6$, $2^3 = 8$, $2\cdot 5 = 10$, $2\cdot 7 = 14$, and $3\cdot 5 = 15$. Summing these numbers, we get $6 + 8 + 10 + 14 + 15 = \boxed{53}$.