a(n) is the smallest k such that sigma(sigma(k)) = sigma(sigma(k) - k) + n*k, or 0 if no such k exists.

A292413

a(n) is the smallest k such that sigma(sigma(k)) = sigma(sigma(k) - k) + n*k, or 0 if no such k exists.

Terms

    a(0) =4a(1) =3a(2) =14a(3) =54a(4) =1496a(5) =42520a(6) =177263760a(7) =11712677760

External references