code: def length_limits(max_length_limit, length_limit_step):
      
      string_len = len(str(max_length_limit))
      return [
          str(i).zfill(string_len) for i in
          xrange(
              length_limit_step,
              max_length_limit + length_limit_step - 1,
              length_limit_step
          )
      ]
docs: Generates the length limits