1760831domain: NAppears in sequencesComposite numbers n such that the sum of divisors of n, sigma(n), divided by the number of divisors, d(n) and sigma(n) minus n are both rational squares.at n=30A049226Number of length 6 arrays x(i), i=1..6 with x(i) in i..i+n and no value appearing more than 3 times.at n=9A250364