input: Write a function to find the divisors of a number.
  assert find_divisors(48) == [2, 3, 4, 6, 8, 12, 16, 24, 48]
  assert find_divisors(15) == [3, 5, 15]
  assert find_divisors(7) == [7]
output: def find_divisors(n):
      return [i for i in range(2, n + 1) if n % i == 0]