#include<cstdio>
#define Nmax 1000005

using namespace std;

int f[Nmax],i,j,dp[Nmax][8],T;

int main()
{
    freopen("divprim.in","r",stdin);
    freopen("divprim.out","w",stdout);
    for(i = 2;i < Nmax; ++i)
        if(!f[i])
            for(j=i;j<Nmax;j+=i) ++f[j];
    for(i = 2;i < Nmax; ++i)
    {
        for(j=1;j<=7;j++)
            dp[i][j]=dp[i-1][j];
        dp[i][f[i]]=i;
    }
    scanf("%d",&T);
    while(T--)
    {
        scanf("%d%d",&i,&j);
        printf("%d\n",dp[i][j]);
    }
    return 0;
}