-2476098domain: ZAppears in sequencesa(n) = 1 - n^5.at n=19A024003Jordan function J_{-5}(n) multiplied by n^5.at n=18A189923a(n) = Sum_{d|n, d==1 mod 4} d^5 - Sum_{d|n, d==3 mod 4} d^5.at n=18A321821