Numbers k such that sigma(phi(k)) = k-phi(k).
A070171
Numbers k such that sigma(phi(k)) = k-phi(k).
Terms
- a(0) =2a(1) =18a(2) =84a(3) =15210a(4) =15216a(5) =66720a(6) =2858880a(7) =62905344a(8) =358313760a(9) =3633603510
External references
- oeis: A070171