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

Let’s say the number is 100: that’s 25 times 4 ... But it takes a lot of time and computing power to try all the prime numbers up to a hundred or more digits long. This is how encryption ...

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