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

int main()
{
    int  i,j,n,t,r,u,s,t1;
    bool ok,ok1;
    f=fopen("progresie.in","r");
    g=fopen("progresie.out","w");
    fscanf(f,"%lld",&t);
    for(i=1;i<=t;i++)
    {
        fscanf(f,"%d %d",&n,&r);
        for(j=1;j<=10000000;j++)
        {
            if((j>=(trunc(sqrt(j))+1)*trunc(sqrt(j))+1 &&
j<=(trunc(sqrt(j))+1)*(trunc(sqrt(j))+1)) || sqrt(j)==trunc(sqrt(j)))
            {
                t1=j;
                ok=true;
                for(u=1;u<n;u++)
                {
                    ok1=true;
                    t1=t1+r;
                    if(sqrt(t1)==trunc(sqrt(t1))) ok1=false;
                if(ok1==true)
{if((t1>=(trunc(sqrt(t1))+1)*trunc(sqrt(t1))+1 &&
j<=(trunc(sqrt(t1))+1)*(trunc(sqrt(t1))+1))) s++; else {ok=false;
break;}}
                }
            }
            if(ok==true) break;
        }
        fprintf(g,"%d\n",j);
    }
    fclose(f);
    fclose(g);
    return 0;
}