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 vote171 views1 answer
Resharper render pages folder asp.net core
C#
22 votes165 views6 answers
Console.writeline
C#
19 votes180 views6 answers
Property 'name' has no initializer and is not definitely assigned in the constructor.ts(2564)
C#
2 votes154 views3 answers
Find an item in a list by LINQ
C#
0 vote180 views1 answer
Iterate through a gameobject in unity
C#Unity
0 vote164 views1 answer
Unity repeat coroutine
C#
13 votes166 views6 answers
Function c#
C#
0 vote219 views1 answer
Get parent name unity for inspector
C#Unity
45 votes216 views6 answers
Unity C# random number
C#Unity
4 votes200 views1 answer
Unity check when clicked on object
C#Unity