public static void Run()
{
var start = DateTime.Now;
long number = 600851475143;
int maxPrime = (int)Math.Floor(Math.Sqrt(number));
var generator = new SieveOfEratosthenes(maxPrime, true);
int largest = 0;
foreach (int prime in generator.Primes)
{
Console.WriteLine(prime);
if (number%prime == 0)
largest = prime;
}
Console.WriteLine("{0} is the largest prime factor of {1}", largest, number);
Console.WriteLine("it took {0} seconds to calcluate this", DateTime.Now.Subtract(start).TotalSeconds);
}
public static void Run()
{
var start = DateTime.Now;
long number = 600851475143;
int maxPrime = (int)Math.Floor(Math.Sqrt(number));
var generator = new SieveOfEratosthenes(maxPrime, true);
int largest = 0;
foreach (int prime in generator.Primes)
{
Console.WriteLine(prime);
if (number % prime == 0)
{
largest = prime;
}
}
Console.WriteLine("{0} is the largest prime factor of {1}", largest, number);
Console.WriteLine("it took {0} seconds to calcluate this", DateTime.Now.Subtract(start).TotalSeconds);
}
