Numbers k such that j(k)*ud(k)=phi(k), j(n) = A033831, ud(n) = number of unitary divisors of n (A034444).
A033854
Numbers k such that j(k)*ud(k)=phi(k), j(n) = A033831, ud(n) = number of unitary divisors of n (A034444).
Terms
- a(0) =3a(1) =4a(2) =8a(3) =15a(4) =20a(5) =28a(6) =40a(7) =102a(8) =132a(9) =140a(10) =252a(11) =360a(12) =510a(13) =780
External references
- oeis: A033854