43046803domain: NAppears in sequencesa(n) = Sum_{d|n} n^(d-1).at n=8A308814a(n) = Sum_{d|n} 9^(d-1).at n=8A339689a(n) = Sum_{d|n} d^(d + n/d - 2).at n=8A359701a(n) = Sum_{d|n} (-n)^(d-1).at n=8A383003