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#include <iostream>
#include <fstream>
using namespace std;
int main()
{
ifstream f("divprim.in");
ofstream g("divprim.out");
int t,n,k,ok,aux,d,nr;
f>>t;
while(f>>n)
{
ok=1; f>>k;
while(n>0&&ok==1)
{
aux=n; d=2; nr=0;
while(aux>1)
{
if(aux%d==0)
{
nr++;
while(aux%d==0)
aux=aux/d;
}
d++;
}
if(nr==k)
{
g<<n<<'\n';
ok=0;
}
n--;
}
if(ok==1)
g<<"0"<<'\n';
}
f.close();
g.close();
return 0;
}