public void Test1(long number, long expectedlargestPrime)
        {
            var sut = new E003Largestprimefactor();

            var largestPrim = sut.Largest(number);

            Assert.Equal(expectedlargestPrime, largestPrim);
        }
        public void Solution()
        {
            var sut = new E003Largestprimefactor();

            var max = sut.Largest(600851475143);

            Assert.Equal(6857, max);

/*
 *          Congratulations, the answer you gave to problem 3 is correct.
 *
 *          You are the 476200th person to have solved this problem.
 */
        }