Fixed points of the following function: if n = Product p(i)^r(i) then f(n) = Product (-2+p(i)^(r(i)-1)+p(i)^r(i)).

A055128

Fixed points of the following function: if n = Product p(i)^r(i) then f(n) = Product (-2+p(i)^(r(i)-1)+p(i)^r(i)).

Terms

    a(0) =4a(1) =40a(2) =880a(3) =40480a(4) =3805120a(5) =7174702080

External references