1162261465domain: NAppears in sequencesa(n) = 3^n - 2.at n=18A058481Semiprime nearest to 3^n. In case of a tie, choose the smaller.at n=19A117416Partial sums of A162436.at n=36A164123a(n) = (2 - 3^n)*(-1)^n.at n=19A168589