olymmath

KöMaL 2024 B5395

    Let d(k)d(k) denote the number of positive divisors of a positive integer kk, and let 1<n1<n be an integer. Which sum is larger: d(2)+d(4)+⋯+d(2n)d(2)+d(4)+\dots+d(2n) or (d(1)+d(3)+⋯+d(2n−1))+(d(1)+d(2)+⋯+d(n))(d(1)+d(3)+\dots+d(2n-1))+(d(1)+d(2)+\dots+d(n))?

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