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100 numbers and 1 perfect cube

Source: May Olympiad L2 #5

June 8, 2021
number theory

Problem Statement

Prove that there are 100100 distinct positive integers n1,n2,,n99,n100n_1,n_2,\dots,n_{99},n_{100} such that n13+n23++n1003100\frac{n_1^3+n_2 ^3+\dots +n_{100}^3}{100} is a perfect cube.