It seems strange that in India erotic statues can be seen in temples -- and accompanied by math! What is the magic square doing here? Why place together erotic statues with a mathematical puzzle? And why put both of these in a temple? How does religion sit with sex and with math?
The primes have been known since early antiquity and fascinated the ancient Greeks, who marveled at their nature. What is interesting about prime numbers is that they become rarer as we progress through the integers.