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A227523 Values of n such that L(20) and N(20) 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
31, -185, -269, -743, -857, -1193, -1637, 1711, 1945, 2371, -2417, 2713, 2917, 3121, 3667, 4567, -4787, -6317, 6451, 6985, 7981, 8923, 9013, 9853, -10109, 11365, 11521, -12449, 12757, 13063, -13343, 13387, -14003, -14093, -14855, 15103, 15247, -15605, 16483, -16577, 17371, 17527, -17783, -18119, -18413, -18455, -18563, 18703, 18763, -18995, 19165, 19555 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..239

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-A227522.

Sequence in context: A139496 A145838 A243522 * A055788 A042876 A042878

Adjacent sequences:  A227520 A227521 A227522 * A227524 A227525 A227526

KEYWORD

sign,easy

AUTHOR

Vincenzo Librandi, Jul 14 2013

STATUS

approved

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Last modified November 20 14:54 EST 2019. Contains 329337 sequences. (Running on oeis4.)