primes with primitive root 10

[Richard Guy]

By coincidence, I've just run across
MR 2004j:11141, which speaks of the
unearthing by Lenstra & Stevenhagen
of correspondence on this topic
between the Lehmers & Artin.   R.

On Tue, 19 Oct 2004, Richard Guy wrote:

> See The Book of Numbers, pp.169--171.
>
> More references on pp.129--130 of Eric
> Weisstein's Encyclopedia.
>
> N.B.  Artin's constant is not  1/e.   R.
>
> On Tue, 19 Oct 2004, Klaus Brockhaus wrote:
>
>> 
>> Seqfans,
>> 
>> are there any results concerning the density of 
>> primes with primitive root 10 (A001913), or of Long 
>> period primes, (A006883) relative to the sequence of 
>> all primes (A000040)?
>> 
>> and the same question for primes with primitive root 
>> 2 (A001122)?
>> 
>> Thanks,
>> Klaus
>> 
>