#include<fstream>
using namespace std;
ifstream fin("divprim.in");
ofstream fout("divprim.out");
int i,j,n,k,t;
int v[1000005];
int a[1000005][8];
int main(){
    for(i=2;i<=1000000;i++){
        if(v[i]==0){
            for(j=i;j<=1000000;j+=i){
                v[j]++;
            }
        }
    }
    a[1][0]=1;
    for(i=2;i<=1000000;i++){
        for(j=0;j<=7;j++){
            a[i][j]=a[i-1][j];
        }
        a[i][v[i]]=i;
    }
    fin>>t;
    for(i=1;i<=t;i++){
        fin>>n>>k;
        fout<<a[n][k]<<"\n";
    }
    return 0;
}