#include <fstream>
#include <iostream>
using namespace std;

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

const int NMAX = 1000000;
int v[NMAX + 1];
int A[NMAX + 1][8];

void ciur()
{
    for(int i = 2; i <= NMAX; i += 2)
        v[i] = 1;
    for(int i = 3; i * i <= NMAX; i++)
        if(v[i] == 0)
            for(int j = i; j <= NMAX; j += i)
                v[j]++;
    for(int i = 2; i <= NMAX; i++)
        if(v[i] == 0)
            for(int j = i; j <= NMAX; j += i)
                v[j]++;
}

int main()
{
    ciur();
    for(int i = 2; i <= NMAX; i++)
    {
        for(int j = 1; j <= 7; j++)
            A[i][j] = A[i - 1][j];
        A[i][v[i]] = i;
    }
    int T, n, k;
    f >> T;
    while(T--)
    {
        f >> n >> k;
        g << A[n][k] << '\n';
    }
    return 0;
}