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#include<fstream>
#include<vector>
#include<algorithm>
using namespace std;
ifstream fin("divprim.in");
ofstream fout("divprim.out");
int f[1000002], sol[1000002][9];
int i, j, t, n, k;
int main(){
for(i=2;i<=1000000;i++)
if(f[i]==0)
{
for(j=i;j<=1000000;j+=i)
f[j]++;
}
for(i=2;i<=1000000;i++)
{
for(j=1;j<=7;j++)
{
if(f[i]==j)
sol[i][j]=i;
else
sol[i][j]=sol[i-1][j];
}
}
fin>>t;
for(i=1;i<=t;i++)
{
fin>>n>>k;
fout<<sol[n][k]<<"\n";
}
fin.close();
fout.close();
return 0;
}