136068domain: NAppears in sequencesa(n) = 3*a(n-3) + a(n-2), a(0)=3, a(1)=0, a(2)=2.at n=23A231101Let s denote the sum of the abundant numbers in the aliquot parts of x. Sequence lists numbers x such that sigma(s) = usigma(x), where usigma(x) is the sum of the unitary divisors of x (A034448).at n=26A258135