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#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
int kR = 1;
int n;
ifstream f("divprim.in");
ofstream g("divprim.out");
void rez()
{
int nr, div;
f>>nr>>div;
while(nr>1)
{
int aux = nr;
int nrdiv = 0;
if(aux%2 == 0)
{
nrdiv++;
while(aux%2 == 0)
{
aux/=2;
}
}
for(int i = 3; aux!=1; i+=2)
if(aux%i == 0)
{
nrdiv++;
while(aux%i == 0)
{
aux/=i;
}
}
if(nrdiv == div)
break;
else
nr--;
}
if(nr == 1 || nr == 0)
g<<0<<"\n";
else
g<<nr<<"\n";
}
int main()
{
f>>n;
for(int i = 0; i<n; i++)
rez();
}