kumikill

3/30/2016 - 3:34 PM

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 10 001st prime number?

```
using System;
public class Program
{
public static void Main()
{
int i = 0;
int prime = 0;
do
{
prime += IsPrime(i) ? 1 : 0;
i++;
} while (prime != 10001);
Console.WriteLine(--i);
}
static bool IsPrime(int n)
{
int bound = (int)Math.Sqrt(n);
if (n == 0 || n == 1) return false;
for (int i = 2; i <= bound; ++i)
if (n % i == 0) return false;
return true;
}
}
```