618570

Appears in sequences

• Larger of unitary amicable pair.at n=14A002953
• Unitary amicable numbers.at n=29A063991
• 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=21A066785