This Simple Sum Is Driving Internet Users Wild

Here is a sequence of numbers: 1 - 11 - 21 - 1211 - 111221 - 312211 - ???

It may seem complicated at first glance, and yet there is nothing simpler when you know what the answer is! You don’t need to do any calculations, even a primary school child who can only count up to 3 can figure it out. Intriguing isn’t it?

Once you've taken a minute to think about it, check out the video above for the solution to this fiendish brain teaser!