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#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin ("divprim.in");
ofstream fout ("divprim.out");
const int NMAX=1e6;
int v[NMAX+5][10],prime[NMAX+5];
int main()
{
int n,k,t,i,j,d=0;
prime[1]=1;
for(i=2;i<=1000000;i++)
{
if(prime[i]==0)
{
for(d=i;d<=1000000;d=d+i)
{
prime[d]++;
}
}
}
for(i=2;i<=1000000;i++)
{
for(j=1;j<=7;j++)
{
v[i][j]=v[i-1][j];
}
v[i][prime[i]]=i;
}
fin>>t;
for(i=1;i<=t;i++)
{
fin>>n>>k;
fout<<v[n][k]<<"\n";
}
return 0;
}