686287domain: NAppears in sequencesa(n) = n^n-n^(n-1)-n^(n-2)-n^(n-3)-...-n^3-n^2-n.at n=6A117667Bases b for which there exists an integer y such that y^2 in base b looks like [c,d,c,d,c,d] for some base-b digits c, d.at n=6A290173