Project Euler: Problem 7
By listing the first six prime numbers: 2, 3, 5, 7, 11, and 13, we can see that the 6th prime is 13.
What is the 10001st prime number?
var answer = new Eratosthenes().Take(10001).Last();
And that's it. It takes around 50 milliseconds, which is totally acceptable I would say. It can be sped up quite a bit though if we find a more efficient prime number generator. This, however, I will try to do in a later problem.