E. Bach and &. Sorenson, Explicit bounds for primes in residue classes, Math. Comp, vol.65, issue.216, pp.1717-1735, 1996.

R. P. Brent, Computing Aurifeuillian factors, in Computational algebra and number theory (Sydney, 1992), Math. Appl, vol.325, pp.201-212, 1995.

D. A. Burgess, On character sums and primitive roots, Proc. London Math. Soc, issue.3, pp.179-192, 1962.

H. Cohen, A course in computational algebraic number theory. Graduate Texts in Mathematics, vol.138, 1993.

A. Granville and &. Pleasants, Aurifeuillian factorization. Math. Comp, vol.75, issue.253, pp.497-508, 2006.

D. R. Heath-brown, Zero-free regions for Dirichlet L-functions, and the least prime in an arithmetic progression, Proc. London Math. Soc, issue.3, pp.265-338, 1992.

H. Iwaniec, On the problem of Jacobsthal, Demonstratio Math, vol.11, issue.1, pp.225-231, 1978.

. Pari/gp, , 2008.

A. Schinzel, On primitive prime factors of a n ?b n, Proc. Cambridge Philos. Soc, vol.58, pp.555-562, 1962.

P. Stevenhagen, On Aurifeuillian factorizations. Nederl. Akad. Wetensch. Indag. Math, vol.49, issue.4, pp.451-468, 1987.

. Talence-cedex and E. France,