from math import*
def Fraction(a,b):
  g=gcd(a,b)
  a//=g
  b//=g
  if b<0:
    a=-a
    b=-b
  return a,b
for _ in range(int(input())):
  n=int(input())
  a=[*map(int,input().split())]
  ans=1
  g=a[0]
  for i in a[1:]:
    t=10**len(str(i))
    _,b=Fraction(g*t+i,t)
    ans=lcm(ans,b)
    g=gcd(g,i)
  print(ans)