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 ...

Let's look at these numbers now. 38 and 31 38 and 3 are both in the thirties, but 38 comes after 31 on the 100 square, so we know 38 is greater than 31. 21 is greater than 20 and 25 is greater ...