93849domain: NAppears in sequencesNumbers m such that Sum_{d|m} (tau(d)/sigma(d)) is an integer h where tau(k) = the number of the divisors of k (A000005) and sigma(k) = the sum of the divisors of k (A000203).at n=9A323781Expansion of 1/(1 - x/(1 - 4*x)^(1/2))^3.at n=8A382540