BALTIC-WAY 2013 Problem 16
We call a positive integer n delightful if there exists an integer k,1<k<n, such that
1+2+⋯+(k−1)=(k+1)+(k+2)+⋯+n
Does there exist a delightful number N satisfying the inequalities
20132013<20132013N<20132013+4?
Dataset text NuminaMath olympiads. Quoted with source.
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