58089domain: NAppears in sequences[ n(n-1)(n-2)(n-3)/13 ].at n=31A011923Numbers m that minimize | k / EulerPhi(k) - golden ratio phi | when k runs over all the numbers with the same number of digits as m.at n=9A065657a(n) = n^2*(n*(4*n + 3) + 3*n*(-1)^n - 4)/96.at n=33A302758