Imagine you are a student sitting in a class and the teacher asks “1, 2, 3, and?” Our answers might drown in a chorus response because let’s face it, there’s no denying 4 is the ‘right’ answer. It’s what strikes you first. However, have you considered 5 as a possible answer? For instance, 1, 2, and 3 have no other factors other than 1 and themselves. That means, 5 can also be the answer to the question “1, 2, 3, and?” Not to forget, there could be a dozen more answers if you're creative enough.