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Voutier1995

Voutier, P. M., "Primitive divisors of Lucas and Lehmer sequences," Math. Comp., 64:210 (1995) 869--888.  MR1284673 [From the review: "The theme of this paper is Lucas and Lehmer sequences whose nth element has no primitive divisor. Stewart has shown that for given n there are only finitely many such sequences, and they can be explicitly determined. This paper does that explicit job for all n< 30"]