#include <bits/stdc++.h>

#define NMAX 1000005
using namespace std;

ifstream fin("divprim.in");
ofstream fout("divprim.out");

int nrdiv[NMAX], dp[NMAX][8];

void make_ciur(){
    for(int i = 2; i <= NMAX - 5; ++i)
        if(nrdiv[i] == 0)
            for(int j = i; j <= NMAX - 5; j += i)
                nrdiv[j]++;
}

int main()
{
    make_ciur();
    for(int i = 2; i <= NMAX - 1; ++i){
        for(int j = 1; j <= 7; ++j)
            dp[i][j] = dp[i - 1][j];
        dp[i][nrdiv[i]] = i;
    }

    int t;
    fin >> t;

    while(t--){
        int n, k;
        fin >> n >> k;

        fout << dp[n][k] << '\n';
    }
    return 0;
}