http://blog.mvballtech.com/2008/03/is-91-prime.html
Rated • 5 reviews • mvballtech.com
"Quick -- without looking it up, tell me: Is 91 prime?
Hard to say, isn't it? It looks fairly prime. It's odd; it's not divisible by 5 or 11 -- or 3 either..."
Hard to say, isn't it? It looks fairly prime. It's odd; it's not divisible by 5 or 11 -- or 3 either..."
