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

0 vote260 views1 answer
C# on alt + f4
C#
51 votes230 views5 answers
Array declaration in c#
C#
4 votes239 views1 answer
What are access modifiers in c#
C#
1 vote276 views1 answer
Unity raycast all layers except one
C#
3 votes230 views1 answer
C# save pdf stream to file
C#
2 votes254 views1 answer
Asp.net data annotations Datetime
C#
1 vote238 views1 answer
Approval, rejection and pending in asp dotnet core 3.1
C#
21 votes239 views6 answers
C# reverse a string
C#
0 vote243 views1 answer
Yanderedev
C#
0 vote241 views1 answer
Ascii art american flag
C#