That is true. I was mainly thinking about (for a prime ). However, your suggestion (b) looks sensible as well.
Thanks for your comment!
Robert Samal
Re: Question needs refining...
That is true. I was mainly thinking about (for a prime
  (for a prime  ). However, your suggestion (b) looks sensible as well.
). However, your suggestion (b) looks sensible as well. 
Thanks for your comment!
Robert Samal