Prime numbers

Does anyone else find the Sieve of Eratosthenes and the ilk a totally pointless concept?

It like over optimising a Java program that could be written in C in a short space of time.

>>25
Computing it is just observing it, dipshit. And yes, I've computed Pi, as well as other irrational numbers.

f(x) = xth digit in pie.
Go figure that one out.