public static void main(String[] args) {
int begin = 111;
int end = 666;
int before = 1;
for (int i = begin; i <= end; i++) {
if (surePrimeNumber(i)) {
if (i - before == 2) {
System.out.println("这是一对孪生素数" + before + ":" + i);
}
before = i;
}
}
}
public static boolean surePrimeNumber(int num) {
for (int i = 2; i < num; i++) {
if (num % i == 0) return false;
}
return true;
}