20141231 and 20150101 are consecutive primes?

Main.java

// A program to see if 20141231 and 20150101 are consecutive prime numbers.
// Answer: Nope, neither is a prime, and there are lots of primes in between!

class Main
{
    private static int minFactor(int n)
    {
        assert (n >= 3) && (n % 2 != 0);

        for (int j = 3; j * j <= n; j += 2) {
            if (n % j == 0) {
                return j;
            }
        }
        return n;
    }

    public static void main(String[] args)
    {
        for (int k = 20141231; k <= 20150101; k += 2) {
            System.out.printf("%d: %d%n", k, minFactor(k));
        }
    }
}