olymmath

BALTIC-WAY 2013 Problem 16

    We call a positive integer nn delightful if there exists an integer k,1<k<nk, 1<k<n, such that

    1+2+⋯+(k−1)=(k+1)+(k+2)+⋯+n1+2+\cdots+(k-1)=(k+1)+(k+2)+\cdots+n

    Does there exist a delightful number NN satisfying the inequalities

    20132013<N20132013<20132013+4?2013^{2013}<\frac{N}{2013^{2013}}<2013^{2013}+4 ?

    Dataset text NuminaMath olympiads. Quoted with source.

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