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#include <fstream>
using namespace std;
ifstream fin("divprim.in");
ofstream fout("divprim.out");
int ciur[1000002];
int val[1000002][10];
int main()
{
for(int i=2; i <= 1000000; i++)
{
if(ciur[i] == 0)
{
ciur[i]++;
for(int j = 2*i; j<= 1000000; j+=i)
ciur[j]++;
}
}
for(int i = 2;i <= 1000000; i++)
for(int j = 1; j <= 7; j++)
if(ciur[i] == j)
val[i][j] = i;
else
val[i][j] = val[i-1][j];
int n,t,k;
fin >> t;
for(int i=1; i<=t;i++)
{
fin >> n >> k;
fout << val[n][k] << "\n";
}
return 0;
}