61883domain: NAppears in sequencesNumber of n-covers of an unlabeled 4-set.at n=8A005746Numbers whose set of base-13 digits is {2,3}.at n=31A032813a(n) is the numerator of the density of natural numbers m such that gcd(m,floor(m/n))>1.at n=14A250032Numerators a(n) of the rational-valued function s(n) defined below.at n=13A250034