#include <stdio.h>
#define maxl 1000010
using namespace std;
FILE*f=fopen("divprim.in","r");
FILE*g=fopen("divprim.out","w");
int cr[1000010], a[1000010][10], i, j, t, n, k;

void ciur(){
    int i,j;
    for(i=2; i<1000001; i++)
        if(cr[i]==0)
            for(j=i; j<1000001; j+=i)
                cr[j]++;
}

int main(){
    ciur();
    for(i=2; i<1000001; i++)
    {
        for(j=0; j<8; j++)
            a[i][j]=a[i-1][j];
        a[i][ cr[i] ]=i;
    }
    fscanf(f,"%d",&t);
    for(i=1; i<=t; i++)
    {
        fscanf(f,"%d%d", &n, &k);
        fprintf(g,"%d\n", a[n][k]);
    }
    fclose(f);
    fclose(g);
    return 0;
}