#include <bits/stdc++.h>

using namespace std;

//是不是质数
bool IsPrime(int n) {
    for (int i = 2; i <= n / i; i++)
        if (n % i == 0)return false;
    return true;
}

//是不是回文数
bool isHuiWen(int n) {
    int i = n;
    int m = 0;
    while (i) {
        m = m * 10 + i % 10;
        i /= 10;
    }
    return m == n;
}

int main() {
    //定义输出文件
    //ofstream out("../LuoGuBook/L4_14.txt");
    ofstream out("c:/L4_14.txt");
    for (int i = 2; i <= 100000000; i++)
        if (IsPrime(i) && isHuiWen(i)) out << i <<",";
    //关闭输出文件
    out.close();
    return 0;
}