-1771560domain: ZAppears in sequencesa(n) = 1 - n^6.at n=11A024004a(n) = Sum_{d|n, d==1 mod 4} d^6 - Sum_{d|n, d==3 mod 4} d^6.at n=10A321822a(n) = Sum_{d|n, d==1 mod 4} d^6 - Sum_{d|n, d==3 mod 4} d^6.at n=21A321822