A227522 Values of n such that L(19) and N(19) 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.

-123, -221, -255, -311, 487, -561, 709, -1055, 1273, -1425, -1475, -1767, 1833, -1893, 2127, -2391, -2475, -2595, 2769, -2895, -3053, -3183, -3543, -3627, 3765, 3919, 4069, -4113, 4203, 4315, 4609, -4953, 5175, 5347, 5413, -5657, 6117, -6515, -6585, -6597, -6833, 6915

Offset

1,1

Comments

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

Links

Vincenzo Librandi and Joerg Arndt, Table of n, a(n) for n = 1..421

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: A179127 A153254 A360639 * A193431 A306643 A303241

Adjacent sequences: A227519 A227520 A227521 * A227523 A227524 A227525

Keyword

sign,easy

Author

Vincenzo Librandi, Jul 14 2013

Status

approved