34495530domain: NAppears in sequencesGreatest k such that floor(k/r^n)=n, where r = golden mean = (1+sqrt(5))/2.at n=28A182615a(n) = sigma(n)*Lucas(n) where Lucas(n) = A000204(n) and sigma(n) = A000203(n) is the sum of divisors of n.at n=28A225528