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#include <iostream>
#include <fstream>
using namespace std;
int ciur[1000001],d[8][1000001];
int main()
{
ifstream fin ("divprim.in");
ofstream fout ("divprim.out");
// relizare ciur
int p=1000000;
for (int i=2;i<=p;i++){
if (ciur[i]==0){
for (int j=i;j<=p;j=j+i){
ciur[j]++;
}
}
}
// am terminat ciurul
// salvarea tuturor raspunsurilor poisbile
for (int i=0;i<=7;i++){
for (int j=0;j<=p;j++){
if (ciur[j]=i){
d[i][j]=j;
}
else {
d[i][j]=d[i][j-1];
}
}
}
int t;
fin >> t;
for (int a=1;a<=t;a++){
int n,k;
fin >> n;
fin >> k;
fout << d[n][k];
}
return 0;
}