#include using namespace std; using ll = long long; using ld = long double; using ull = unsigned long long; template using MaxHeap = std::priority_queue; template using MinHeap = std::priority_queue, greater>; #define rep2(i, n) for (ll i = 0; i < (n); i++) #define rep3(i, l, r) for (ll i = (l); i < (r); i++) #define rrep2(i, n) for (ll i = n; i-- > 0;) #define rrep3(i, r, l) for (ll i = (r); i-- > (l);) #define overload(a, b, c, d, ...) d #define rep(...) overload(__VA_ARGS__, rep3, rep2)(__VA_ARGS__) #define rrep(...) overload(__VA_ARGS__, rrep3, rrep2)(__VA_ARGS__) #define all(x) begin(x), end(x) bool chmin(auto& lhs, auto rhs) { return lhs > rhs ? lhs = rhs, 1 : 0; } bool chmax(auto& lhs, auto rhs) { return lhs < rhs ? lhs = rhs, 1 : 0; } struct IOIO { IOIO() { std::cin.tie(0)->sync_with_stdio(0); } } ioio; void solve() { // K < x <= N // xが素数なら当然OK ll n, k; cin >> n >> k; ll x = n; while (x > k) { bool ok = true; for (ll y = 1; y * y <= x; y++) { if (x % y == 0) { ll z = x / y; if (y <= k && z <= k) { ok = false; break; } } } if (ok) { cout << x << '\n'; return; } x--; } cout << -1 << '\n'; } int main() { int t = 1; cin >> t; while (t--) solve(); }