Function f (x). For any n belonging to a positive integer, f (f (n)) = 3N, f (n + 1) > F (n), f (n) belongs to a positive integer. Find f (1) and f (12)

Function f (x). For any n belonging to a positive integer, f (f (n)) = 3N, f (n + 1) > F (n), f (n) belongs to a positive integer. Find f (1) and f (12)

Let n = 1 get f [f (1)] = 3, it is easy to know that f (1) = 2, f (2) = 3. Let n = 2 get f [f (2)] = f (3) = 6, let n = 3 get f [f (3)] = f (6) = 9, | f (4) = 7, f (5) = 8