Write a program to input a number and check whether it is Mersenne Number or not?(a number is said to be Mersenne number if it is one less than a power of 2, ex- 7 is a Mersenne number 8-1= 7 is the power of two 2^3)

36)  Write a program to input a number and check whether it is Mersenne Number or not?(a number is said to be Mersenne number if it is one less than a power of 2, ex- 7 is a Mersenne number 8-1= 7 is the power of two 2³)

import java.util.*;

public class Mersenne_number

{

    public static void main(String args[ ])

    {

        Scanner sc = new Scanner (System.in);

        System.out.println("Enter a number");

        int a = sc.nextInt();

        double p = a+1;

        while(p>1.0)

        {

            p=p/2.0;

        }

        if(p==0)

        {

            System.out.println("Entered number is a MERSENNE number");

        }

        else

        {

            System.out.println("Entered number is not a MERSENNE number");

        }

    }

}

 Write a program to input two numbers and check whether these are Co-Prime or not? (12=1, 2, 3, 4, 6, 12,    25=1, 5, 25 both have one common factor is 1, so it is Co-Prime number.)