#include <fstream>
using namespace std;
int cr[1000001],v[8][1000001];
int main() {
	ifstream f("divprim.in");
	ofstream g("divprim.out");
	int i,j,t,k,p;
	for (i=2; i<=1000000; i++)
		if (!cr[i]) {
			j=1; 
			while (i*j<=1000000) {
				cr[i*j]+=1;
				j++;
			}
		}
	for (i=2; i<=1000000; i++) {
		for (j=0; j<=7; j++)
			v[j][i]=v[j][i-1];
		if (cr[i]<=7)
			v[cr[i]][i]=i;
	}		
		
	f>>t;
	for (i=1; i<=t; i++) {
		f>>p>>k;
		g<<v[k][p]<<'\n';
	}		
	g.close();
	return 0;
}