olymmath

KöMaL 2026 B5522

    Does there exist a sequence of positive integers a1a_1, a2a_2, …\ldots and positive integer NN such that for every n≥Nn\geq N, an<an+1<a1+a2+…+ana_n<a_{n+1}<{a_1+a_2+\ldots+a_n} and an+1∣a1+a2+…+ana_{n+1}\mid a_1+a_2+\ldots+a_n?

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