Prime number Upto n

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

0 vote223 views1 answer
.net Core Return File like File Server
C#
1 vote234 views2 answers
Unity create random string
C#Unity
0 vote221 views1 answer
You have the following c# code. sb is a a very long string. you need to identify whether a string stored in an object named stringtofind is within the stringbuilder sb object. which code should you use?
C#
0 vote201 views1 answer
Unity reset random seed
C#Unity
0 vote231 views1 answer
What is void onmousedown()
C#
8 votes214 views1 answer
Get all child gameObject of gameObject C#
C#
1 vote189 views1 answer
Jitter on collision for 2 rigid bodies
C#
1 vote219 views2 answers
Merge xml files into one c#
C#
1 vote235 views1 answer
C# add int var
C#
1 vote219 views1 answer
Dotween sequence wait
C#