a(n) = least k such that E{1,2,...,k} >= 1^2 + 2^2 + ... + n^2, where E = 2nd elementary symmetric function.

A027923

a(n) = least k such that E{1,2,...,k} >= 1^2 + 2^2 + ... + n^2, where E = 2nd elementary symmetric function.