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A227449 Values of n such that L(11) and N(11) are both prime, where L(k) = (n^2+n+1)*2^(2*k) + (2*n+1)*2^k + 1, N(k) = (n^2+n+1)*2^k + n. 20
13, 15, 25, 87, -111, 159, 199, 285, 309, -381, 549, -585, 615, -633, 633, 663, -717, -765, -885, 907, -951, 967, 999, 1117, -1131, 1135, -1161, -1187, 1299, 1357, -1515, 1585, -1655, 1777, -1977, -2067, 2089, 2103, -2141, -2201, 2287, 2293, -2351, -2355, -2433, -2505, -2517, 2517, 2563, 2673, -2685, 2743, -2771, -2823, 2853, -2993 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Computed with PARI using commands similar to those used to compute A226921.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..281

Eric L. F. Roettger, A cubic extension of the Lucas functions, Thesis, Dept. of Mathematics and Statistics, Univ. of Calgary, 2009. See page 195.

CROSSREFS

Cf. A226921-A226929, A227448, A227515-A227523.

Sequence in context: A109656 A178724 A087814 * A113801 A108257 A217252

Adjacent sequences:  A227446 A227447 A227448 * A227450 A227451 A227452

KEYWORD

sign,easy

AUTHOR

Vincenzo Librandi, Jul 14 2013

STATUS

approved

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Last modified December 8 17:36 EST 2019. Contains 329865 sequences. (Running on oeis4.)