129179domain: NAppears in sequencesT(n,0) + T(n,1) + ... + T(n,n), T given by A026568.at n=13A026580Numbers n such that if n = a U b (where U denotes concatenation) then sigma*(a) + sigma*(b) = abs(sigma*(n) - n), where sigma*(n) is the sum of the anti-divisors of n.at n=23A239686