60556domain: NAppears in sequencesa(n) = T(n,n-4), T given by A026584. Also a(n) = number of integer strings s(0),...,s(n) counted by T, such that s(n)=4.at n=11A026589Numbers n such that sigma(n) - sigma(n-1) divides n.at n=13A227305Numbers n such that A324187(n) = 0.at n=23A324199