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A131530 Numbers k such that k^2 - k - 1 and k^2 - k + 1 are twin primes. 2
3, 4, 6, 7, 9, 16, 21, 22, 25, 39, 42, 51, 55, 60, 67, 90, 102, 132, 139, 142, 154, 156, 165, 177, 189, 204, 207, 210, 216, 219, 232, 237, 247, 289, 291, 310, 315, 352, 379, 396, 406, 454, 456, 457, 496, 501, 519, 531, 552, 561, 625, 645, 669, 687, 721, 729, 744 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Seiichi Manyama, Table of n, a(n) for n = 1..5000

PROG

(MAGMA) [n: n in [0..500] | IsPrime(n^2-n-1) and IsPrime(n^2-n+1)] // Vincenzo Librandi, Nov 23 2010

CROSSREFS

Intersection of A002328 and A055494. - Michel Marcus, Jan 24 2018

Sequence in context: A127594 A094604 A108654 * A285379 A102093 A135215

Adjacent sequences:  A131527 A131528 A131529 * A131531 A131532 A131533

KEYWORD

nonn

AUTHOR

Pierre CAMI, Aug 26 2007

STATUS

approved

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Last modified October 14 05:08 EDT 2019. Contains 327995 sequences. (Running on oeis4.)