Programming Examples

Java program to generate all 2 digit twisted prime number


Write a program to generate all 2 digit twisted prime number. Twisted prime number is a number which is prime and its reverse is also prime. Example 13 and 31.

Solution

class TwistedPrime
{
	public static void main(String ar[])
	{
		int i,j,r,c1,c2,d;
		for(i=10;i<=99;i++)
		{
			c1=0;
			for(j=1;j<=i;j++)
			{
				if(i%j==0)
					c1++;
			}
			r=0;
			for(j=i;j>0;j/=10)
			{
				d=j%10;
				r=r*10+d;
			}
			c2=0;
			for(j=1;j<=r;j++)
			{
				if(r%j==0)
					c2++;
			}
			if(c1==2 && c2==2)
				System.out.println(i+“ ”);
		}
	}
}
Output

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