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

21 votes266 views3 answers
How to detect collision in unity
C#
2 votes316 views1 answer
Change fog setting Unity
C#
1 vote310 views1 answer
Set label position winforms
C#
0 vote251 views1 answer
Console.readline not working
C#
1 vote278 views1 answer
C# generic return type in interface
C#
2 votes274 views1 answer
Unable to resolve service for type 'Microsoft.AspNetCore.Identity.UserManager
C#
0 vote286 views1 answer
Update squence c#
C#
8 votes284 views1 answer
Unity get number of child objects
C#
0 vote266 views1 answer
Clear highlight winforms treeview
C#
0 vote330 views1 answer
Replace double backslash with single backslash c#
C#