What kind of question is this? You understand compute time depends on machine's CPU, RAM, programs it's running etc. Even "Hello World" could take days.

It would be very difficult to find a machine that takes days to run Hello world now. lol
But you are right, sajhamitra, use the best PC you can get access to and mention the specs when you post the result.

Hey Nas, I appreciate your sharpness on googling and cut pasting the code. There are tons of code you can find with the word SieveOfEratosthenes function in various languages.

At least you should have changed the function name and some variable names and return variable name.

Anyway, I appreciate your aggressiveness in exploring the solutions.

By the way, I don't like VB.net. I am C# guy.

400000 th prime is 5800079
56.246999979 seconds

Process finished with exit code 0

So far i can find 400,000th prime within 1 minute.
Nas bro, try to find the largest prime within 1 minutes limit..

Is this correct? Runs for a minute, output is
1137030nth prime number is 17752279


import java.util.concurrent.TimeUnit;

public class PrimeTest
{
public static void main(final String args[])
{
long start = System.currentTimeMillis();
long currentTime = start;
long count = 0;
long numberToCheck = 1;
long primeNumber = numberToCheck;
while(start < currentTime + TimeUnit.SECONDS.toMillis(60))
{
if (isPrime(numberToCheck))
{
count ++;
primeNumber = numberToCheck;
}
numberToCheck ++;
start = System.currentTimeMillis();
}

System.out.println(count + "th prime number is " + primeNumber);
}

/**
* @param numberToCheck
* @return
*/
private static boolean isPrime(final long numberToCheck)
{
for (int divisor = 2; divisor < Math.sqrt(numberToCheck); divisor ++)
{
if (numberToCheck % divisor == 0)
{
return false;
}
}
return true;
}
}

Prankster : the result is impressive >1.1m th prime within a minute, but the answer doesn't look correct.