26572050

Appears in sequences

• a(n) = n^6*(n+1)^2/2.at n=9A163276
• Numbers k such that phi(sigma(k))/sigma(phi(k)) = 2.at n=27A229238
• a(n) = (1/4!)*3^(n+2)*(n+7)*(n+2)*(n+1)*(n).at n=7A288838