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#include <fstream>
#include <vector>
using namespace std;
ifstream fin("divprim.in");
ofstream fout("divprim.out");
int ok[1000001],n,m,k;
vector <int> G[8];
void ciur()
{
for(int i=0;i<8;i++)
G[i].push_back(0);
G[0].push_back(1);
for(int i=2;i<=1000000;i++)
{
if(ok[i]==0)
{
for(int j=1;i*j<=1000000;j++)
ok[i*j]++;
}
if(ok[i]<8)
G[ok[i]].push_back(i);
}
}
int cauta(int val)
{
int in=0,fi=G[k].size()-1,poz=0;
while(in<=fi)
{
int mid=(in+fi)/2;
if(G[k][mid]==val)
return G[k][mid];
else
if(G[k][mid]<val)
{
in=mid+1;
poz=mid;
}
else
fi=mid-1;
}
return G[k][poz];
}
int main()
{
fin>>n;
ciur();
for(int i=1;i<=n;i++)
{
fin>>m>>k;
fout<<cauta(m)<<"\n";
}
return 0;
}