229026

Appears in sequences

• Numbers 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=15A066785
• Triangle T(n,k), read by rows: coefficients for numerical integration near a singularity (n >= 0 and 0 <= k <= n).at n=34A324124
• Improved version of A002686; secondary main diagonal of A324124.at n=6A328885