cyclic numbers: A086018

[Jud McCranie]

At 05:57 PM 8/29/2003, Eric W. Weisstein wrote:
>Does anyone know if any further terms are known to
>
>A086018 0,1,9,60,467,3617,29500
>
>(the number of cyclic numbers <= 10^n)?
>
>Unless I'm missing something, it appears to be very computationally
>expensive to get even the next term.


Aren't these simply the primes that have 10 as a primitive root?  Then I 
get 248881 for the next term.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://list.seqfan.eu/pipermail/seqfan/attachments/20030829/9dbfce0a/attachment-0001.htm>