# Primes, Twin Primes, Triplets of Primes: How Many? (VIDEO!)

Euclid (ca. 300 BCE) proved that the list of primes (as single numbers) goes on forever. In this video we swiflty go over his proof, and then ask: What about twin primes (the pair 11-13, for example)? Does the list of those go on forever? What about triplets of primes (the tiple 3-5-7, for example)? Does that list go on forever?