64788

Appears in sequences

• Numbers n such that sigma(n)=sigma(d_1)*sigma(d_2)*...*sigma(d_k) where d_1 d_2 ... d_k is the decimal expansion of n.at n=21A098771
• a(n) = (n + 1)*(4*n^2 + 14*n + 9)/3.at n=35A268484