96722domain: NAppears in sequencesa(n) = 1 + a(floor(n/2))*a(ceiling(n/2)) for n > 1, a(1) = 3.at n=9A005510[ exp(7/8)*n! ].at n=7A030958a(n) = 81*n^2 - 72*n + 17.at n=35A154277Numbers k such that (209*10^k - 17)/3 is prime.at n=22A286176