Numbers k such that phi(k) divides sigma(k) and sigma(k)/k > sigma(m)/m for all m < k.
A007668
Numbers k such that phi(k) divides sigma(k) and sigma(k)/k > sigma(m)/m for all m < k.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =12a(4) =840a(5) =332640
External references
- oeis: A007668