#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;
ifstream cin("divprim.in");
ofstream cout("divprim.out");



    int i,j,n,k,t,a[1000005][15],b[1000005];
   int main()
    for(i=2;i<=1000000;i++)
    {

    }    if(!b[i]);
     {for(b[i]=1,j=2*i;j<=1000000;j+=i )

     }
       for(i=1;i<=1000000;i++)
       {
           for(j=0;j<=14;j++) a[i][j]=a[i-1][j];
           a[i][b[i]]=i}
           cin>>t;
           while(t--)

        cin>>n>>k;
        cout<<a[n][k]<<'\n';
        return 0;
       }