/* -*- coding: utf-8 -*-
 *
 * 3474.cc:  No.3474 Concat Decimal - yukicoder
 */

#include<cstdio>
#include<algorithm>
#include<numeric>

using namespace std;

/* constant */

const int MAX_N = 200000;

/* typedef */

using ll = long long;

/* global variables */

int as[MAX_N];

/* subroutines */

/* main */

int main() {
  int tn;
  scanf("%d", &tn);

  while (tn--) {
    int n;
    scanf("%d", &n);
    for (int i = 0; i < n; i++) scanf("%d", as + i);

    ll x = 1;
    for (int i = 1; i < n; i++) {
      ll a = as[i];
      while (a > 0 && a % 10 == 0) a /= 10;
      ll t = 1;
      while (t <= a) t *= 10;
      ll g = gcd(a, t);
      x = lcm(x, t / g);
    }

    printf("%lld\n", x);
  }

  return 0;
}