#include <stdio.h>
#include <string.h>
using namespace std;
FILE*fin=fopen("divprim.in","r");
FILE*fout=fopen("divprim.out","w");
int c[1000010], a[1000010][10], i, j, t, n, k;


int main()
{
    int i,j;
    for(i=2; i<1000001; i++)
        if(c[i]==0)
            for(j=i; j<1000001; j+=i)
                c[j]++;
    for(i=2; i<1000001; i++)
    {
        for(j=0; j<8; j++)
            a[i][j]=a[i-1][j];
        a[i][ c[i] ]=i;
    }
    fscanf(fin,"%d",&t);
    for(i=1; i<=t; i++)
    {
        fscanf(fin,"%d%d", &n, &k);
        fprintf(fout,"%d\n", a[n][k]);
    }

    return 0;
}