Question

What is the 15th prime number, if they are listed in order?

Answer 1

`47`

Explanation:

A prime number has only 2 factors, 1 and itself.

There is no pattern for the prime numbers, so you will have to write them out. It is useful to know the prime numbers less than 100 by heart. The first 15 are:

`2," "3," "5," "7," "11," "13," "17," "19," "23," "29," "31," "37," "41," "43," "47 .....`