1977326742domain: NAppears in sequencesa(n) = 7^n-1.at n=11A024075a(n) = n^11 - 1.at n=6A258812a(n) = Sum_{d|n, n/d==1 mod 4} d^11 - Sum_{d|n, n/d==3 mod 4} d^11.at n=6A321835