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#include<fstream>
#include<iostream>
#include<vector>
#include <cstring>
using namespace std;
ifstream fin("divprim.in");
ofstream fout("divprim.out");
int n,m,k,i,j,p,x,y,nr[1000005],t,d[8][1000005];
const int nmax=1000000;
void ciur()
{
int i,j;
//for(i=2;i<=nmax;i++) nr[i]=1;
for(i=2;i<=nmax;i++)
{
if(nr[i]==0)
{
//fout<<"ok";
for(j=i;j<=nmax;j=j+i)
{
nr[j]++;
}
}
}
for(i=1;i<=nmax;i++)
{
d[nr[i]][i]=i;
}
for(i=1;i<=7;i++)
{
for(j=1;j<=nmax;j++)
{
d[i][j]=max(d[i][j],d[i][j-1]);
}
}
for(i=1;i<=7;i++)
{
for(j=1;j<=nmax;j++)
{
//fout<<d[i][j]<<" ";
}
//fout<<"\n";
}
}
int main()
{
ciur();
fin>>t;
for(i=1;i<=t;i++)
{
fin>>x>>y;
fout<<d[y][x]<<"\n";
}
}