[seqfan] Possible number of units in a ring

[Charles Greathouse]

Sequence A070932 is described in a comment:

By considering the ring Z_n and the finite fields GF(q) this sequence
contains the values of Euler function (A000010) and prime powers - 1 .
By taking direct products if n and m belong to the sequence so is m*n.

Do these conditions suffice to describe all terms of the sequence?

Charles Greathouse
Analyst/Programmer
Case Western Reserve University