88825domain: NAppears in sequencesDenominator of f(n) := Product_{i=1..n} sigma(i)/i.at n=19A111934Denominator of f(n) := Product_{i=1..n} sigma(i)/i.at n=20A111934a(n) = n*(6*n^2 - 8*n + 3).at n=25A272378