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

using ll = long long;

bool chmin(auto &a, auto b) { return a > b ? a = b, true : false; }
bool chmax(auto &a, auto b) { return a < b ? a = b, true : false; }

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int T;
    cin >> T;
    while (T--) {
        int N, K;
        cin >> N >> K;
        auto check = [&] (int M) -> bool {
            for (int a = 1; a * a <= M; a++) {
                if (M % a == 0) {
                    int b = M / a;
                    if (a <= K && b <= K) return false;
                }
            }
            return true;
        };
        int M = max(1, N - 300);
        int ans = -1;
        while (N >= M) {
            if (check(N)) {
                ans = N;
                break;
            }
            N--;
        }
        cout << ans << '\n';
    }
}