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#include <bits/stdc++.h>
using namespace std;
ifstream f("divprim.in");
ofstream g("divprim.out");
int n,m,k,p=1,i,j;
bitset<1000010> pr;
bool ok=true;
int main()
{
pr[0]=pr[1]=1;
for(i=4; i<=1000000; i+=2)
pr[i]=1;
for(i=3; i<=1000; i+=2)
if(!pr[i])
for(j=i*i; j<=1000000; j+=i)
pr[j]=1;
f>>n;
for(int i=1; i<=n; i++)
{
p=1;
int x=3;
f>>m>>k;
while(k)
{
if(pr[x]==0&&k!=1)
{
k--;
ok=false;
p*=x;
}
else if(pr[x]==0&&k==1&&ok==true)
p*=x;
x++;
}
if(p<=m)
g<<p<<'\n';
else
g<<"0\n";
}
return 0;
}