322687697778domain: NAppears in sequencesJordan function J_9(n).at n=18A069094a(n) = n^9 - 1.at n=18A258810a(n) = Sum_{d|n, n/d==1 mod 4} d^9 - Sum_{d|n, n/d==3 mod 4} d^9.at n=18A321833