1060802domain: NAppears in sequencesNumbers n such that sigma(n+1)+sigma(n)=3n.at n=9A067806Numbers k such that (sigma(k)+sigma(k+1))/k is an integer.at n=13A068078Numbers k such that sigmawt(k) = sigmawt(k+1), where sigmawt(k) is the sum of the divisors of k weighted by divisor multiplicity in k.at n=29A171183