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Omni-MATH / Denote Z_(>0)=1,2,3,... the set of all positive integers. Determine all functions f:Z_(>0)→Z_(>0) such that, for each positive integer n, hspace1cmi) sum_k=1^nf(k) is a per… · Discussion

Discussing Denote Z_(>0)={1,2,3,...} the set of all positive integers. Determine all functions f:Z_(>0)→Z_(>0) such that, for each positive integer n, hspace{1cm}i) sum_{k=1}^{n}f(k) is a per… · Omni-MATH

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