802652domain: NAppears in sequencesG.f. satisfies: A(x) = 1 + 2*x*A(x) + 5*x^2*A(x)^2.at n=9A249925The smallest positive number k such that the sum of the products of its digits when written in all bases 2 to n equals k, or -1 if no such number exists.at n=34A376860