IMO Shortlist 1977 problem 1
Dodao/la:
arhiva2. travnja 2012. Find all functions

satisfying following condition:
%V0
Find all functions $f : \mathbb{N}\rightarrow \mathbb{N}$ satisfying following condition:
$$f(n+1)>f(f(n)) \quad \forall n \in \mathbb{N}$$
Izvor: Međunarodna matematička olimpijada, shortlist 1977