-6858domain: ZAppears in sequencesa(n) = 1 - n^3.at n=19A024001a(n) = Sum_{d|n, d==1 mod 4} d^3 - Sum_{d|n, d==3 mod 4} d^3.at n=18A050459a(n) = Sum_{d|n, d==1 mod 4} d^3 - Sum_{d|n, d==3 mod 4} d^3.at n=37A050459Multiplicative with a(p^e) = 1 - p^3.at n=18A063453