Numbers k such that sigma(k)-2*k = phi(k): abundance of k equals Eulerphi of k.
A088826
Numbers k such that sigma(k)-2*k = phi(k): abundance of k equals Eulerphi of k.
Terms
- a(0) =12a(1) =42a(2) =1242a(3) =6137440a(4) =1385119360a(5) =1588268480
External references
- oeis: A088826