Let U(P, Q) and V(P, Q) be Lucas sequences generated by P and Q, and define
D congruent P^2 - 4Q.
Let n be an odd composite number with (n, D) = 1, and n - (D/n) = 2^s d with d odd and s>=0, where (a/b) is the Legendre symbol. If
U_d congruent 0 (mod n)
or
V_(2^r d) congruent 0 (mod n)
for some r with 0<=r
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