Twisted Prime Number – SchoolCodeHub

Twisted Prime Number is a number which itself is a Prime Number and it’s reverse is also a Prime Number.

Example 1: 13. When reversed it is 31. Both of them are Prime Number. Hence it is a Twisted Prime Number.

Example 2: 19. When reversed it is 91. Here only 19 is a Prime Number but it’s reverse 91 is not a Prime Number since it is divisible by 7 and 13 also. Hence it is not a Twisted Prime Number.

Java

import java.util.*;
public class TwistedPrimeNumber
{
    public static void main(String args[])
    {
        int n=0,r=0,rev=0,nCopy=0,flag=0;
        Scanner sc=new Scanner(System.in);
        System.out.print("Enter a number: ");
        n=sc.nextInt();
        nCopy=n;
        while(n>0)
        {
            r=n%10;
            rev=(rev*10)+r;
            n=n/10;
        }
        n=nCopy;
        for(int i=1;i<=n;i++)
        {
            if(n%i==0)
            {
                flag++;
            }
        }
        if(flag==2)
        {
            flag=0;
            for(int i=1;i<=rev;i++)
            {
                if(rev%i==0)
                {
                    flag++;
                }
            }
        }
        if(flag==2)
        {
            System.out.println(n+" is a Twisted Prime Number");
        }
        else
        {
            System.out.println(n+" is not a Twisted Prime Number");
        }
    }
}