怀疑PTA数据有误

• 以下代码没过

#include <bits/stdc++.h>
using namespace std;
const int N = 1e6 + 10, inf = 0x3f3f3f3f;
int n, m, a[N];

bool isp(int n) {
    for (int i = 2; i <= n / i; i++)
        if (n % i == 0)
            return 0;
    return n > 1;
}
int re(int n) {
    int t = 0;
    while (n)
        t = t * 10 + n % 10, n /= 10;
    return t;
}
int main() {
    ios::sync_with_stdio(false), cin.tie(0), cout.tie(0);
    cin >> n;
    for (int i = 2; i <= n; i++)
        if (isp(i) && isp(re(i)) && i != re(i))
            cout << i << " ";
    return 0;
}