[seqfan] Possible number of units in a ring

Charles Greathouse charles.greathouse at case.edu
Tue Apr 17 18:16:28 CEST 2012

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
Case Western Reserve University

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