118500domain: NAppears in sequencesSmaller member of an infinitary amicable pair.at n=22A126169Smaller of bi-unitary amicable pair.at n=23A292980Lesser of tri-unitary amicable numbers pair: numbers (m, n) such that tsigma(m) = tsigma(n) = m + n, where tsigma(n) is the sum of the tri-unitary divisors of n (A324706).at n=16A324708