465036042240domain: NAppears in sequencesNumbers k for which sigma(k)/k - 4/7 is an integer.at n=19A218411Numbers m such that g(m) = (m * tau(m) / sigma(m)), h(m) = (m * sigma(m)) / tau(m) and k(m) = (tau(m) * sigma(m)) / m are all integers.at n=22A333639