#include <cstdio>

using namespace std;
int v[1000005],t,n,i,j,dr,k,ok,a[1000005][8];
int main()
{
    freopen("divprim.in","r",stdin);
    freopen("divprim.out","w",stdout);
    for(i=2;i<=1000000;i++)
        if(v[i]==0)
    {
        v[i]=1;
        for(j=2*i;j<=1000000;j+=i)
        v[j]++;

    }
    for(i=2;i<=1000000;i++)
    {
        for(j=1;j<=7;j++)
            a[i][j]=a[i-1][j];
        a[i][v[i]]=i;
    }

    scanf("%d",&t);
    for(i=1;i<=t;i++)
    {

        scanf("%d%d",&n,&k);
        printf("%d\n",a[n][k]);
    }
    return 0;
}