Looking for Wagstaff modulus

[Torbjorn Granlund]

Vincent Diepeveen <diep at xs4all.nl> writes:

  I'm looking for which version/beta version of GMP has a built in fast
  modulus for wagstaff which is of the formula p = (2^n + 1) / 3.
  
You seem to have gotten few replies, which is proably because nobody
understood which operation you are askig about.

I'll try to respond if you desribe it more clearly.  What modulus are
you talking about?

-- 
Torbjörn