Exercise06_27.java

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/**
 *
 * @author jorda
 */
public class Exercise06_27 {
    public static void main(String[] args) {
        int NumEmirp = 1;
        int NumToTest = 11;
        while (NumEmirp <= 100){
            NumToTest++;
            if(isPrime(NumToTest) && isPrime(reverse(NumToTest)) && !isPalindrome(NumToTest)){
                if(NumEmirp % 10 != 0)
                    System.out.print(NumToTest + " ");
                else
                    System.out.println(NumToTest);
                NumEmirp++;
            }
        }
    }
    
    
    public static boolean isPrime(int number) {
        for (int divisor = 2; divisor <= number / 2; divisor++) {
            if (number % divisor == 0) { // If true, number is not prime
                return false; // number is not a prime
            }
        }

        return true; // number is prime
    }
    
    public static int reverse(int number){
        int reverse = 0;
        while(number > 0){
            int lastDigit = number % 10;
            reverse = (reverse * 10) + lastDigit;
            number /= 10;
        }
        return reverse;
    }
    
    public static boolean isPalindrome(int number){
        return number == reverse(number);
    }
}