-40353606domain: ZAppears in sequencesa(n) = 1 - n^9.at n=7A024007a(n) = Sum_{d|n, d==1 (mod 4)} d^9 - Sum_{d|n, d==3 (mod 4)} d^9.at n=6A321825a(n) = Sum_{d|n, d==1 (mod 4)} d^9 - Sum_{d|n, d==3 (mod 4)} d^9.at n=13A321825