A005479 Prime Lucas numbers (cf. A000032). (Formerly M2627)

2, 3, 7, 11, 29, 47, 199, 521, 2207, 3571, 9349, 3010349, 54018521, 370248451, 6643838879, 119218851371, 5600748293801, 688846502588399, 32361122672259149, 412670427844921037470771, 258899611203303418721656157249445530046830073044201152332257717521

Offset

1,1

Comments

It appears that a(n) is the intersection ( or a subset of the intersection ) of A113192[n], Primes that are the difference of two Lucas numbers and A113188[n], Primes that are the difference of two Fibonacci numbers, excluding A113192[1] = A113188[1] = 2. - Alexander Adamchuk, Aug 06 2006

For n>2 also: Primes which are the sum of four consecutive Fibonacci numbers, a(n) = A153867(n-2), cf. link to SeqFan list (Apr. 2014). - M. F. Hasler, Apr 24 2014

Conjectures: 7, 47 and 2207 are the only a(n) mod 10 = 7. They are also the only a(n) values where the Lucas index is not a prime. See A001606 for the Lucas index values of these primes. See A266587 for the divisibility of Lucas numbers by powers of primes. - Richard R. Forberg, Mar 24 2016

References

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Links

T. D. Noe, Table of n, a(n) for n = 1..28

J. Brillhart, P. L. Montgomery and R. D. Silverman, Tables of Fibonacci and Lucas factorizations, Math. Comp. 50 (1988), 251-260.

Harvey P. Dale and others, A005479 and A153867, SeqFan list, Apr 24 2014.

Blair Kelly, Factorizations of Lucas numbers

Ron Knott, The First 200 Lucas numbers and their factors.

Tony D. Noe and Jonathan Vos Post, Primes in Fibonacci n-step and Lucas n-step Sequences, J. of Integer Sequences, Vol. 8 (2005), Article 05.4.4.

Eric Weisstein's World of Mathematics, Lucas Number

Mathematica

Select[LucasL[Range[0, 250]], PrimeQ] (* Harvey P. Dale, Nov 02 2011 *)

Crossrefs

Cf. A000032, A001606, A113192, A113188.

Sequence in context: A014981 A227885 A096362 * A120856 A138000 A322118

Adjacent sequences: A005476 A005477 A005478 * A005480 A005481 A005482

Keyword

nonn,nice

Author

N. J. A. Sloane

Extensions

One further term (from the Knott web site) from Parthasarathy Nambi, Jun 27 2008

Status

approved