820808domain: NAppears in sequencesNumbers k whose abundance sigma(k) - 2*k = -16. Numbers k whose deficiency is 16.at n=15A125248Numbers k such that sigma(k) == 0 (mod k-8).at n=25A274562Deficient numbers k > 1 such that k*p is abundant for all primes p dividing k.at n=29A341358