Mathematical and Physical Journal
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Problem A. 562. (April 2012)

A. 562. Let f(k)=2k+1 for arbitrary positive integer k. Is there any positive integer n which divides f(f(n)), but does not divide f(f(f(n)))?

(5 pont)

Deadline expired on May 10, 2012.


1 student sent a solution.
5 points:Strenner Péter.

Problems in Mathematics of KöMaL, April 2012