75479040domain: NAppears in sequencesAmicable numbers k that can be expressed as a sum k = x+y = A001065(x) + A001065(y) and a sum k = z+t = A001065(z) + A001065(t) where (x, y, z, t) are parts of two amicable pairs and A001065(i) is the sum of the aliquot parts of i.at n=4A359334a(n) = n!*tetranacci(n+3).at n=9A365293