3898440domain: NAppears in sequencesa(n) = n^2*(n^2 + 1)*(n-1).at n=21A037250a(n) = Product_{d|n, d<n} A019565(A003714(d)), where A003714(n) is the n-th Fibbinary number.at n=41A300834Noncubefree numbers k such that A073185(k) > 2*k.at n=12A357700