786554688domain: NAppears in sequencesa(n) = 16*a(n-1) - a(n-2) with a(0) = 0, a(1) = 3.at n=8A001080Numbers k such that 7*k^2 = floor(k*sqrt(7)*ceiling(k*sqrt(7))).at n=15A084069Square root of floor[A055859(n)/7].at n=25A204517Denominators of the other-side convergents to sqrt(7).at n=30A259596