public class $ {
public static void main(String[] args) {
for (int i = 1; i <= 1000; i++) {
if (!check(i)) {
continue;
}
if (huiweishu(i)) {
System.out.println(i);
}
}
}
private static boolean check(int num) {
int sqrt = (int) Math.sqrt(num);
for (int j = 2; j < sqrt + 1; j++) {
if (num % j == 0) {
return false;
}
}
return true;
}
private static boolean huiweishu(int i) {
int a;
if (i < 99) {
a = i / 10;
} else {
a = i / 100;
}
return a == i % 10;
}
}
11
101
131
151
181
191
313
353
373
383
727
757
787
797
919
929