#include <iostream>
using namespace std;

// 判断是否是素数
bool isPrime(int n)
{
    if (n < 2) return false;

    for (int i = 2; i * i <= n; i++)
    {
        if (n % i == 0)
            return false;
    }
    return true;
}

// 判断是否是回文数
bool isPalindrome(int n)
{
    int original = n;
    int reversed = 0;

    while (n > 0)
    {
        reversed = reversed * 10 + n % 10;
        n /= 10;
    }

    return original == reversed;
}

int main()
{
    cout << "100到1000之间的回文素数有：" << endl;

    for (int i = 100; i <= 1000; i++)
    {
        if (isPrime(i) && isPalindrome(i))
        {
            cout << i << " ";
        }
    }

    return 0;
}