Determine smallest factor other than 1 using Console App

Determining the smallest factor when a specific number is given. (other than 1)

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace SmallestFactor

{

    class Program

    {

        static void Main(string[] args)

        {

            /*When a number is given, find the smallest factor other than 1.

            Try reading the number and see if its less than 1. If its 1, then print 1

            as the factor. If its less than 1 then exit. if its greater or equals to 2

            find the factor. Using a counter whenever the remainder becomes zero, as soon

             as the counter becomes 2, break the loop.*/

            Console.WriteLine("Enter number for which Smallest Factor needs to be found : ");

            int number = Convert.ToInt32(Console.ReadLine());

            if (number < 1)

            {

                Console.WriteLine("Enter number greater than or equal to 1. Exiting app.");

                Console.ReadKey();

                return;

            }

            int counter = 0;

            int i = 0;

            for (i = 1; i <= number; i++)

            {

                if (number == 1)

                    break;

                if (number % i == 0)

                {

                    {

                        counter = counter + 1;

                        if (counter == 2)

                        {

                            break;

                        }

                    }

                }

            }

            Console.WriteLine("The smallest factor for {0} is {1}", number, i);

            Console.ReadKey();

        }

    }

}

Determining the smallest factor for a set of numbers (between min and max numbers)

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace SmallestFactor

{

    class Program

    {

        static void Main(string[] args)

        {  
         /* Select the smallest and biggest numbers. If smallest or biggest is less than 1 or             if max is less than min, then abort. Whenever the modulo is equal to 0 ,                     increment the counter. If counter = 2, then exit and type in the value of i*/

            Console.WriteLine("Enter the minimum number : ");

            int minnumber = Convert.ToInt32(Console.ReadLine());

            Console.WriteLine("Enter the maximum number : ");

            int maxnumber = Convert.ToInt32(Console.ReadLine());

           

            if ((minnumber < 1) || (maxnumber < 1) || (maxnumber <= minnumber))

            {

                Console.WriteLine(@"Either Minimum is less than 1 Or Maximum is less than 1                   Or Maximum is less than Minimum. Exiting Application.");

                Console.ReadKey();

                return;

            }

           

            int i = 0;

            int numseq = 0;

            for (numseq = minnumber; numseq <= maxnumber; numseq++)

            {

                int counter = 0;

                for (i = 1; i <= numseq; i++)

                {

                    if (numseq == 1)

                        break;

                    if (numseq % i == 0)

                    {

                        {

                            counter = counter + 1;

                            if (counter == 2)

                            {

                                break;

                            }

                        }

                    }

                }

                Console.WriteLine("The smallest factor for {0} is {1}", numseq, i);

            }

            Console.ReadKey();

        }

    }

}