JAVA Program for Twin Prime Number

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Twin Prime Number



A twin prime is a prime number that is either 2 less or 2 more than another prime number. 
Example- (5,7),  (11,13),  (17,19).
In other words, a twin prime is a prime that has a prime gap of two. Sometimes the term twin prime is used for a pair of twin primes; an alternative name for this is prime twin or prime pair.

Java Program :

class TwinPrimes {
    public static void main(String args[]) {
        String primeNo = "";
        int j = 0;
        int LastPrime = 1;
        System.out.println("Twin Primes are:");
        for (int i = 1; i < 100; i++) {
            for (j = 2; j < i; j++) {
               if (i % j == 0) {
               break;
               }
            }
            if (i == j) {
               primeNo += i + " ";
               if ((i - LastPrime) == 2) {
               System.out.println("("+(i-2)+","+i+")");
               }
               LastPrime = i;
            }
        }
        System.out.println("Prime Numbers are: " + primeNo);
    }
}


Output

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