Question

What comes next in this sequence of prime numbers? 11, 13, 17, 19, ?

Answer 1

`23`

Explanation:

A prime number is a whole number greater than `1` whose only factors are `1` and itself. We just test numbers after `19` to see if they fit this definition. `20` is divisible by `4` and `5`, so we can rule it out. `21` is divisible by `7` and `3`, so we can rule it out. `22` is divisible by `11` and `2`, so we can rule it out.

The first number we come across who fits the definition is `23`.