Answer Posted / srinivasu

i have written in java
import java.io.*;
public class ThreeDigit
{
public static void main(String args[])throws IOException
{
double t=1;
DataInputStream ds=new DataInputStream(System.in);
System.out.print("Enter Three Digit Number");
int n=Integer.parseInt(ds.readLine());
int k=0;
for(int i=1;i<=n;i++)
{
t=t*2;
}
t=t+1;
int x=2;
do
{
if(t%x==0)
{
System.out.println("The 2^n+1 of given 3 digit
number" +t+ "is not prime");
System.out.println("The factors for" +t+ "are:");
for(int p=1;p<=t;p++)
{
if(t%p==0)
{k++;
System.out.println("The"+k+"factor is"+p);
}
}
System.exit(0);
}
x++;
}while(x<t);
System.out.println("The 2^n+1 number"+t+"is prime");
System.exit(0);
}
}

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