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Old 2019-06-25, 23:59   #4
R. Gerbicz
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"Robert Gerbicz"
Oct 2005

101111110102 Posts

Originally Posted by GP2 View Post
There are no double Wagstaff primes for p ≤ 23. All of these have known factors. For higher p I know of no PRP tests or even the most basic factoring attempts.
If W(p) is composite then W(W(p)) is also composite (and all iterated versions).
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