4715895382domain: NAppears in sequencesa(n) = 2*n^(n-2).at n=10A003308Denominator of Euler(n, 1/11).at n=9A156293Period of the fraction 1/11^n for n >= 1.at n=9A334603Numbers k such that the Diophantine equation x^3 + y^3 + z^3 = k has nontrivial primitive parametric solutions.at n=20A338932