Generate Prime Numbers

using System;
public class Program
{
    static void Main(string[] args)
    {
        var results = GenerateSieve(1000);
        var i=0;
        foreach (var item in results)
        {
            if(item) Console.Write(i + " ");
            i++;
        }
    }
 
    static bool[] GenerateSieve(int num)
    {
        // Creating an array indicating whether numbers are prime.
        bool[] isPrime = new bool[num + 1];
        for (int i = 2; i <= num; i++) isPrime[i] = true;
 
        // Removing out multiples.
        for (int i = 2; i <= num; i++)
        {
            // Check if i is prime.
            if (isPrime[i])
            {
                // Eliminate multiples of i.
                for (int j = i * 2; j <= num; j += i)
                    isPrime[j] = false;
            }
        }
        return isPrime;
    }
}

Source: ideone.com

Similar codes

1 vote340 views1 answer
C# add guid to array
C#
0 vote360 views1 answer
C# convert 1 to 01
C#
2 votes292 views1 answer
Cursor visible unity
C#
0 vote436 views1 answer
C# process start
C#
6 votes333 views2 answers
Unity rotate vector around point
C#
1 vote342 views1 answer
C# + max char frequency in string
C#
0 vote351 views1 answer
How to do if statement based on date in asp net c#
C#
0 vote373 views1 answer
How to lerp a value in unity
C#
3 votes348 views6 answers
Capitalize first letter c#
C#
11 votes363 views2 answers
Unity change tmp text from script
C#