478401domain: NAppears in sequencesSqrt(sigma(A008847(n)^2)), where A008847 lists m such that sigma(m^2) is a square.at n=24A163763Numbers that have exactly 9 representations as a k-gonal number, P(n,k) = n*((k-2)*n - (k-4))/2, k and n >= 3.at n=5A321159