You should end up with a list of 25 prime numbers between 1 and 100. These are shown in the grid below.

So, if p is a prime number then its only factors will be 1 and p itself. Examples: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, ... (the list continues infinitely) Pythagoras Theorem: Definition ...

A prime number has exactly two factors, itself and one. The first ten prime numbers are \({2}\), \({3}\), \({5}\), \({7}\), \({11}\), \({13}\), \({17}\), \({19 ...