184783domain: NAppears in sequencesNumbers k such that the period of the continued fraction for sqrt(k) contains exactly 65 ones.at n=21A031833G.f. satisfies: A(x) = exp( Sum_{n>=1} A(x^n) / A(-x^n) * x^n/n ).at n=14A198785Totient highly abundant numbers that are composite.at n=15A286322