2147040

Appears in sequences

• Expansion of e.g.f.: (1-x)^(-1/2)*exp(-x/2 -x^2/4 -x^3/6 -x^4/8).at n=11A053533
• Numbers k such that sigma(k) = phi(k)*(sum of the digits of k).at n=9A140173
• Expansion of e.g.f. (1+x) * exp(x^2*(1+x)).at n=10A387968