223020domain: NAppears in sequencesLarger of unitary amicable pair.at n=8A002953Unitary amicable numbers.at n=18A063991Numbers taking exactly 21 steps to reach 15 in A086793.at n=15A119397Number of reduced words of length n in Coxeter group on 9 generators S_i with relations (S_i)^2 = (S_i S_j)^3 = I.at n=6A162755