884730domain: NAppears in sequencesn such that 3 < sigma(n)/n < sigma(m)/m for all abundant numbers m<n such that 3 < sigma(m)/m.at n=11A259312Unitary barely 3-abundant: numbers m such that 3 < usigma(m)/m < usigma(k)/k for all numbers k < m, where usigma is the sum of unitary divisors function (A034448).at n=27A336671