10862674480domain: NAppears in sequencesBase 3 digits are, in order, the first n terms of the periodic sequence with initial period 1,0,0.at n=21A033139Base 9 digits are, in order, the first n terms of the periodic sequence with initial period 3,1,0.at n=10A037665a(n) = (27^n - 1)/26.at n=8A218730