1760616domain: NAppears in sequencesNumbers k such that (k, phi(k), sigma(k)) lies on a sphere with integral radius centered at the origin, i.e., k^2 + phi(k)^2 + sigma(k)^2 is a square.at n=26A066785T(n,k) = number of linear arrays of n 1's, n -1's, and k 0's such that no two adjacent elements are equal.at n=86A283613