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#include <bits/stdc++.h>
using namespace std;
ifstream fin("divprim.in");
ofstream fout("divprim.out");
int n,t,k,c[1000001],a[1000001][8];
int main()
{
for(int i=2;i<=1000000;i++)
{
if(c[i]==0)
{
for(int j=i+i;j<=1000000;j+=i)
c[j]++;
c[i]=1;
}
}
for(int i=2;i<=1000000;i++)
{
if(c[i]<=7)
a[i][c[i]]=i;
for(int j=1;j<=7;j++)
if(j!=c[i])
a[i][j]=a[i-1][j];
}
fin>>t;
for(int i=1;i<=t;i++)
{
fin>>n>>k;
fout<<a[n][k]<<'\n';
}
return 0;
}