import sys
import math
input = sys.stdin.readline
def read_values(): return map(int, input().split())
def read_index(): return map(lambda x: int(x) - 1, input().split())
def read_list(): return list(read_values())
from fractions import Fraction

def main():
  n=int(input())
  a=read_list()
  a.pop(0)
  g=1
  for v in a:
    vv=Fraction(v,1)
    while vv>=1:
      vv/=10
    g=math.lcm(g,vv.denominator)
  print(g)
      
if __name__ == "__main__":
  t=int(input())
  for _ in range(t):
    main()