The set of primes dividing the Lucas numbers has density $2/3$.
Lagarias, J. C.
Pacific J. Math., Tome 120 (1985) no. 2, p. 449-461 / Harvested from Project Euclid
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Publié le : 1985-05-14
Classification:  11B05,  11B39 
@article{1102706452,
     author = {Lagarias, J. C.},
     title = {The set of primes dividing the Lucas numbers has density $2/3$.},
     journal = {Pacific J. Math.},
     volume = {120},
     number = {2},
     year = {1985},
     pages = { 449-461},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1102706452}
}

Lagarias, J. C. The set of primes dividing the Lucas numbers has density $2/3$.. Pacific J. Math., Tome 120 (1985) no. 2, pp.  449-461. http://gdmltest.u-ga.fr/item/1102706452/