14129647351domain: NAppears in sequencesBase 7 digits are, in order, the first n terms of the periodic sequence with initial period 1,0.at n=12A033117a(n) = (49^n - 1)/48.at n=7A218753a(n) = (n^(2n)-1)/(n^2-1) for n > 1, a(1) = 1.at n=6A343009