Problem A. 499. (January 2010)
A. 499. Prove that there exist positive constants c and n_{0} with the following property. If A is a finite set of integers, A=n>n_{0}, then
AAA+An^{2}cn^{8/5}.
Miklós Schweitzer Memorial Competition, 2009
(5 pont)
Deadline expired on 10 February 2010.
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