input: Write a python function to filter out elements in an array that are divisible by a given number.
  assert filter_divisible([23, 45, 12, 35, 29], 3) == [23, 35, 29]
  assert filter_divisible([10, 20, 30, 40, 50], 5) == []
  assert filter_divisible([11, 22, 33, 44, 55], 11) == [22, 33, 44, 55]
output: def filter_divisible(arr, num):
      return [x for x in arr if x % num != 0]