#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    constexpr int r = 10000000;
    vector<bool> used(r + 1);
    used[1] = true;
    vector<ll> S = {-1};
    for(int i = 3; i <= r; i += 2){
        if(used[i]) continue;
        if(!used[i - 2]) S.emplace_back(i * (ll)(i - 2));
        const int d = 2 * i;
        for(int j = i + d; j <= r; j += d) used[j] = true;
    }
    ll n;
    int Q;
    cin >> Q;
    while(Q--) cin >> n, cout << *prev(upper_bound(S.begin(), S.end(), n)) << '\n';
}