#include <cstdio>
#include <vector>

using namespace std;

//vector<int> div;
//vector< vector<int> > mat;

int div[1000005];
int mat[1000000][7];

void ciur()
{
    long i,j;

    for(i=2;i<=1000000;i+=2)
        div[i]++;
    for(i=3;i<=1000000;++i)
        if(!div[i])
            for(j=i;j<=1000000;j+=i)
                div[j]++;

    for(i=2;i<=1000000;++i)
    {
        for(j=0;j<=7;++j)
            mat[i][j]=mat[i-1][j];
        mat[i][div[i]]=i;
    }
}

int main()
{
    freopen("divprimi.in","r",stdin);
    freopen("divprimi.out","w",stdout);

    ciur();

    long t,n,k;
    scanf("%ld",&t);

    long i;
    for(i=1;i<=t;++i)
    {
        scanf("%ld%ld",&n,&k);
        printf("%ld\n",mat[n][k]);
    }

    return 0;
}