docs: def isfib(number):
      """
      Check if a number is in the Fibonacci sequence.
  
      :type number: integer
      :param number: Number to check
      """
  
      num1 = 1
      num2 = 1
      while True:
          if num2 < number:
              tempnum = num2
              num2 += num1
              num1 = tempnum
          elif num2 == number:
              return True
          else:
              return False