Twin Prime Example Java Program
Definition
A twin prime is a prime number that has a prime gap of two. In other words, to qualify as a twin prime, the prime number must be either 2 less or 2 more than another prime number (which by definition would mean that it, too, is a twin prime)?for example, the twin prime pair (41, 43). Two is not considered a twin prime, since it violates the aforementioned rule.Twin Prime Example Program
import java.util.Scanner; public class TwinPrime { public static void main(String a[]){ System.out.print("How many twin primes do you need?"); Scanner in= new Scanner(System.in); int input = in.nextInt(); int i=3,n=35; boolean b,task=true; int count =0; while(task){ if((isPrime(i)) & ( isPrime(i+2))){ count++; System.out.println(" "+(i-2)+" "+i ); if(count==input ){ task = false; } } i+=2; } } public static boolean isPrime(int n) { if (n%2==0) return false;//check if n is a multiple of 2 //if not, then just check the odds for(int i=3;i*i<=n;i+=2){ if(n%i==0) return false; } return true; } }
Sample Output
Output is: How many twin primes do you need? 8 1 3 3 5 9 11 15 17 27 29 39 41 57 59 69 71
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