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On a problem of the 66th NMO. (Asupra unei probleme de la a 66-a O.N.M.) (Romanian. English summary)
Gaz. Mat., Ser. B 120, No. 6-8, 281-286 (2015).
Summary: The purpose of this article is to show the connection between a contest problem and Dirichlet series.
Classification: I30
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