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#include <bits/stdc++.h>
#define DIM 1000005
using namespace std;
ifstream fin("divprim.in");
ofstream fout("divprim.out");
int T,N,K;
int D[7][DIM];
int ciur[DIM];
int main(){
for(int i=2;i<DIM;i++){
if(!ciur[i]){
for(int j=i+i;j<DIM;j+=i)
ciur[j]++;
}
D[ciur[i]][i]=i;
}
for(int i=0;i<7;i++)
for(int j=3;j<DIM;j++)
D[i][j] = max(D[i][j],D[i][j-1]);
fin >> T;
while(T--){
fin >> N >> K;
fout << D[K][N] << "\n";
}
}