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 vote165 views1 answer
Accord.io read .mat file
C#
0 vote173 views1 answer
Stroke dash array wpf
C#
0 vote187 views1 answer
Random seed in c#
C#
29 votes172 views10 answers
Hello world c++
C#
0 vote182 views1 answer
Static Keyword
C#
3 votes181 views1 answer
Show private fields in inspecotr unity
C#
2 votes194 views1 answer
Draw sphere gizmo unity
C#
0 vote174 views1 answer
Unitydont play sound until finsihed
C#
0 vote192 views1 answer
SerializedObjectNotCreatableException: Object at index 0 is null
C#
0 vote185 views1 answer
C# use readonly array as method default
C#