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 vote203 views1 answer
How to play multiple sound at once on c# windows form
C#
1 vote185 views1 answer
Set text in center wpf
C#
2 votes211 views1 answer
Unity 2d how to set an object or the mouse position
C#
0 vote250 views1 answer
Compass direction mobile unity
C#Unity
8 votes141 views3 answers
Char to int c#
C#
0 vote183 views1 answer
Linq while loop in c#
C#
0 vote174 views1 answer
Bitwise Left Shift C#
C#
16 votes185 views2 answers
Import time C#
C#
19 votes188 views2 answers
Unity RemoveComponent
C#
0 vote259 views4 answers
How to turn a string in a char list c#
C#