60822domain: NAppears in sequencesStarting positions of strings of four 8's in the decimal expansion of Pi.at n=3A083638Numbers k such that Sum_{d|k} sigma(d)^3/d is an integer, where d are the divisors of k.at n=13A226566a(n) = Catalan(n) + 2^n - n - 1.at n=11A338726