#include <iostream>
#include<stdio.h>
#include<math.h>
using namespace std;
FILE *f,*g;

int bun(int t)
{
    if ((t=floor(sqrt(t))*floor(sqrt(t))) or (t>=floor(sqrt(t))*floor(sqrt(t))+floor(sqrt(t))+1)) return 1;
    else return 0;
}

int rezultat(int n, int r)
{
   int t=0,j=0,i;
   while (!j)
   {

     t++;
     for(i=0;i<=n-1;i++)
     {
       if (!bun(t+i*r)) j=0;
     }
    return t;
   }



}




int main()
{
    int n,r,t,i;
    f=fopen("progresie.in","r");
    g=fopen("progresie.out","w");
    fscanf(f,"%d\n",t);
    for(i=1;i<=t;i++)
    {
        fscanf(f,"%d%d\n",n,r);
        fprintf(g,"%d\n",rezultat(n,r));
    }
    fclose(f);
    fclose(g);
    return 0;
}