ProjectEuler - 10

问题：

The sum of the primes below 10 is 2 + 3 + 5 + 7 = 17.

Find the sum of all the primes below two million.

翻译：

求出所有小于2000000的质数的和

代码：

package projectEuler;

public class Problem10 {
	private static int N = 2000000;

	public static void main(String[] args) {
		long sum = 0;
		for (int i = 2; i <= N; i++) {
			if (isPrime(i)) {
				sum += i;
			}
		}
		System.out.println("sum=" + sum);
	}

	static boolean isPrime(int n) {
		for (int i = 2; i <= Math.sqrt(n); i++) {
			if (0 == n % i) {
				return false;
			}
		}
		return true;
	}
}