KöMaL 2017 K554

The integers 1 to 2017 are listed as follows: first those numbers not divisible by 3 are written down in increasing order. Then the list continues with those numbers that are divisible by 3 but not divisible by 9, followed by those divisible by 9 but not divisible by 27, and so on. $a)$ What is the last number of the list? $b)$ In which position will 2017 be in the list? $c)$ In which position will 2016 be in the list?