Pythagoras
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A prism.
Hexagon :P
So far there has been no formulas found. The randomness of prime numbers make them unpredictable to calculate. There is a bit of a hit and miss formula, which is (2 to the power of p) - 1, with p being a prime number. Prime numbers that fit this are callled "Mersenne primes". Mathematicians are still searching for a formula that works 100% of the time though. =)
polygons perhaps
Numbuh 2's name is Hoagie P. Gilligan.