Priemgetal

BRADY HARAN: So we're going to talk about the number 8,128. And it's a famous type of number called perfect number. Now, this was the largest perfect number known in antiquity, or for...

BRADY HARAN: We did a video. I'd done it some time ago about Mersenne primes. And offhandedly, just off the cuff, I said that 1 wasn't a prime. Now, if I'm honest, we...