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Old 2021-11-26, 21:04   #7
R. Gerbicz
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"Robert Gerbicz"
Oct 2005

157510 Posts

Originally Posted by kijinSeija View Post
Thanks for your reply :)

Unfortunately, I'm not a mathematician so I think it could be impossible for me to prove it. I try to understand the proof of the Lucas-Lehmer test and trying to transpose it with Wagstaff primes but I don't understand completly the Lucas-Lehmer test. So trying to find a proof for Wagstaff primes is not possible for me I guess.
Wagstaff numbers are pretty special cyclotomic numbers, these are polcyclo(2*p,2)=(2^p+1)/3.
There is no known fast tests (at speed of LL test), though there could be! Note that here for example polcyclo(p,2)=2^p-1 and we have the LL test for these.

This is a same/similar problem to find a test for repunits, (10^p-1)/9 because those are polcyclo(p,10).
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