For thousands of years, philosophers have pondered cardinality: knowing “how many.” Using a series of crude estimates, the ancient Greek mathematician Archimedes worked out the approximate number of ...

Imagine that someone gives you a list of five numbers: 1, 6, 21, 107 and — wait for it — 47,176,870. Can you guess what comes next? If you’re stumped, you’re not alone. These are the first five busy ...

Image made with elements from Canva. Let’s go back to grade school—do you remember learning about prime numbers? They’re numbers that can only be divided by themselves and one. So 2, 3, 5, 7, 11, and ...

Add Yahoo as a preferred source to see more of our stories on Google. Prime numbers are sometimes called math’s “atoms” because they can be divided by only themselves and 1. For two millennia, ...