title: What wrong with my Python code to check the triangular number?
body: <pre><code>def Triangular(n):
      arr = []
      for i in range(n):
          T = i*(i+1)/2
          arr.append(T)
      if n == any(arr):
          return True
      else:
          return False
  </code></pre>
  
  <p>All test cases are in False. Please show me what I was wrong</p>