// #pragma GCC optimize ("Ofast")
// #pragma GCC optimize ("unroll-loops")
// #pragma GCC target ("avx,avx2,fma")
#include <bits/stdc++.h>

using std::cin, std::cout, std::cerr;
using ll = long long;

ll Solve(ll n, ll k) {
    while(n > k) {
        bool ok = true;
        for(ll i = 1; i <= k && i * i <= n; i ++)
            if(n % i == 0 && n / i <= k)
                ok = false;
        if(ok) return n;
        n --;
    }
    return -1;
}

int main() {
    std::ios::sync_with_stdio(false);
    int T; cin >> T;
    while(T --) {
        ll n, k;
        cin >> n >> k;
        cout << Solve(n, k) << '\n';
    }
}