#include <fstream>

using namespace std;
ifstream fin("divprim.in");
ofstream fout("divprim.out");
int ciur[1000001], matrix[8][1000001];
int main()
{
    int x = 2;
    ciur[0] = ciur[1] = 0;
    while (x < 1000001)
    {
        if (ciur[x] == 0)
        {
            int y = x + x;
            while (y < 1000001)
            {
                ciur[y]++;
                y+= x;
            }
        }
        for (int i = 1; i < 8; i++)
        {
            matrix[i][x] = matrix[i][x - 1];
        }
        if (ciur[x] <= 7)
        {
            matrix[ciur[x]][x] = x;
        }
        x++;
    }

    int n, k, m;
    fin >> m;
    for (int i = 0; i < m; i++)
    {
        fin >> n >> k;
        fout << matrix[k][n] << "\n";
    }
    return 0;
}