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#include <bits/stdc++.h>
using namespace std;
ifstream fin("divprim.in");
ofstream fout("divprim.out");
int n;
int ndp[1000001];
int sol[8][1000001];
int main()
{
fin>>n;
int i,r,q;
int j;
for(i=2;i<=1000000;i++)
if(ndp[i]==0)
for(j=i;j<=1000000;j=j+i)
ndp[j]++;
for(i=1;i<=1000000;i++)
sol[ndp[i]][i]=i;
for(i=1;i<=7;i++)
for(j=1;j<=1000000;j++)
if(sol[i][j]!=j)
sol[i][j]=sol[i][j-1];
for(i=1;i<=n;i++)
{
fin>>q>>r;
fout<<sol[r][q]<<'\n';
}
return 0;
}