376591138560domain: NAppears in sequencesNumbers k for which sigma(k)/k - 3/4 is an integer.at n=13A218405Numbers k such that sigma(k) mod k = antisigma(k) mod k, where sigma(k) = A000203(k) = sum of divisors of k, antisigma(k) = A024816(k) = sum of non-divisors of k.at n=23A229088