19487170domain: NAppears in sequencesa(n) = 11^n-1.at n=7A024127Jordan function J_7(n).at n=10A069092a(n) = n^7 - 1.at n=10A258808a(n) = Sum_{d|n, n/d==1 mod 4} d^7 - Sum_{d|n, n/d==3 mod 4} d^7.at n=10A321831Values of records in A368698.at n=23A368989