Sum of primitive roots

[franktaw at netscape.net]

>...  This is because the primitive roots of p^{n+1} are
>precisely those numbers congruent to a primitive root of p^n modulo
>p^n.

Correction: this is only true for n >= 2.  So

>... the next term, if it exists, would have to be either p or 2*p, and
>it is unlikely that there are any more such primes.

There could conceivably be other terms of the form p^2 or 2*p^2.
This is still very unlikely.

Franklin T. Adams-Watters

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