Prime.java

package com.coveros.benchmark;

import java.math.BigInteger;
import java.util.Date;

public class Prime {

	private static final int certainty = 100;

	public static void main(final String[] args) {
		final long start = new Date().getTime();

		final int exp = Integer.valueOf(args[0]);
		final BigInteger num = BigInteger.valueOf(2).pow(exp).subtract(BigInteger.ONE);
		final boolean prime = num.isProbablePrime(certainty);

		System.out.println("2^" + exp + "-1 " + (prime ? "is likely" : "is not likely") + " a Prime Number");

		final long end = new Date().getTime();

		System.out.println("Took " + (end - start) + " milliseconds.");
	}
}