#include<fstream>
#define Nmax 1000005
using namespace std;
ifstream eu("divprim.in");
ofstream tu("divprim.out");
int k,p,t,n,i,j,v[1000001][9],a[1000010];
int main()
{
for(i=2;i<=Nmax;++i)
   if(a[i]==0)
     for(j=i;j<=Nmax;j=j+i)
     a[j]++;
for(i=2;i<=Nmax;++i)
    if(a[i]<=7)
      v[i][a[i]]=i;
for(i=2;i<=Nmax;++i)
    for(j=1;j<=8;++j)
      if(v[i][j]==0)
       v[i][j]=v[i-1][j];
        eu>>t;
for(i=1;i<=t;++i)
{
eu>>p>>k;
tu<<v[p][k]<<'\n';
}
return 0;
}