input: Write a python function to find numbers divisible by 3 up to a given number.
  assert find_divisible_numbers(20) == [3, 6, 9, 12, 15, 18]
  assert find_divisible_numbers(10) == [3, 6, 9]
  assert find_divisible_numbers(5) == [3]
output: def find_divisible_numbers(n):
      return [i for i in range(1, n+1) if i % 3 == 0]