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A227516 Values of n such that L(13) and N(13) 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. 2
25, -33, -285, 325, 349, -449, -621, 661, 843, 975, -977, 991, 1035, -1037, -1137, -1191, -1515, -1593, -1625, 1683, 1693, -1713, 1759, -1803, 1957, 2125, 2523, -2531, -2615, 2827, -2901, -2999, 3033, -3147, 3373, 3391, 3559, 3621, 3663, -3795, 3849, -3855, 3891, 3957, -3993, -4085, -4317, -4323, -4407, 4531, -4617, 4633 (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..278

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, A227449, A227515-A227523.

Sequence in context: A075452 A231572 A020258 * A281369 A188059 A257720

Adjacent sequences:  A227513 A227514 A227515 * A227517 A227518 A227519

KEYWORD

sign,easy

AUTHOR

Vincenzo Librandi, Jul 14 2013

STATUS

approved

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Last modified March 30 05:01 EDT 2020. Contains 333118 sequences. (Running on oeis4.)