Numbers k such that k = sigma(s(s(s(k)))) where s(k) = sigma(k)-k and sigma = A000203.

A387218

Numbers k such that k = sigma(s(s(s(k)))) where s(k) = sigma(k)-k and sigma = A000203.

Terms

    a(0) =44a(1) =248a(2) =11904a(3) =565838a(4) =583730a(5) =16588800

External references