#include <fstream>
using namespace std;

ifstream f("divprim.in");
ofstream g("divprim.out");

const int NMAX = 1000000;

int ciur[NMAX + 1], sol[NMAX + 1][8];
int N, T, K;

void Erathostene(int n)
{
    for(int i = 2; i <= n; i += 2)
        ciur[i] = 1;
    for(int i = 3; i * i <= n; i += 2)
        if(!ciur[i])
            for(int j = i; j <= n; j += i)
                ciur[j]++;
    for(int i=3;i<=NMAX;i++)
        if(!ciur[i])
            for(int j=i;j<=NMAX;j+=i)
            ciur[j]++;
}

void precalcul()
{
    Erathostene(NMAX);
    for(int i = 2; i <= NMAX; i++)
    {
        for(int j = 1; j <= 7; j++)
            sol[i][j] = sol[i - 1][j];
        sol[i][ciur[i]] = i;
    }
}

int main()
{
    precalcul();
    f >> T;
    while(T--)
    {
        f >> N >> K;
        g << sol[N][K] << '\n';
    }
    return 0;
}