Abstract
In this paper, we consider the solvability of the Pellian equation
in cases d = nk, m = n2l−1, where k, l are positive integers, n is a composite positive integer and d = pq, m = pq2, p, q are primes. We use the obtained results to prove results on the extendibility of some D(−1)-pairs to quadruples in the ring
Acknowledgement
The authors would like to thank the referees for their helpful remarks and suggestions which improved the first version of the paper.
((Communicated by István Gaál )
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