See The Pseudoprimes to 25.109, 
 Mathematics of computation, 35 (1980) 1003-1026,  Mathematics of computation, 35 (1980) 1003-1026,
 Carl  Pomerance; J. L.  Selfridge; Samuel S.  Wagstaff.
 At the end of this paper it is conjectured that
 if n is a strong base 2 pseudoprime and a Lucas
 probable prime, then n is in fact a prime.
Last modified 3rd July 2011
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