16983563040domain: NAppears in sequencesJordan function J_8(n).at n=18A069093a(n) = prime(n)^n - 1.at n=7A069459a(n) = n^8 - 1.at n=18A258809a(n) = Sum_{d|n, n/d==1 (mod 4)} d^8 - Sum_{d|n, n/d==3 (mod 4)} d^8.at n=18A321832