input: Write a python function to find all numbers divisible by 7 up to a given number.
  assert find_divisible(50) == [7, 14, 21, 28, 35, 42, 49]
  assert find_divisible(10) == [7]
  assert find_divisible(100) == [7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91, 98]
output: def find_divisible(n):
      return [i for i in range(1, n + 1) if i % 7 == 0]