Numbers k such that phi(k) <= sigma_0(k).

A020490

Numbers k such that phi(k) <= sigma_0(k).

Terms

    a(0) =1a(1) =2a(2) =3a(3) =4a(4) =6a(5) =8a(6) =10a(7) =12a(8) =18a(9) =24a(10) =30

External references