570623341221domain: NAppears in sequencesa(n) = 2*n^n-1.at n=11A062207a(n) = 2*11^n-1.at n=11A198974a(n) = Sum_{1 <= x_1, x_2, ... , x_n <= n} gcd(x_1, x_2, ... , x_n, n)^n.at n=10A372939