488565domain: NAppears in sequencesNumbers n such that n and n+1 have 5 distinct prime factors.at n=8A140079Numbers k such that k and k+1 each have at least 5 distinct prime factors.at n=8A321505Expansion of x^2*(10-5*x+x^2)/((1-x)^4*(1-x^2)).at n=43A331429