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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
OFFSET
1,1
LINKS
Eric L. F. Roettger, A cubic extension of the Lucas functions, Thesis, Dept. of Mathematics and Statistics, Univ. of Calgary, 2009. See page 195.
KEYWORD
sign,easy
AUTHOR
Vincenzo Librandi, Jul 14 2013
STATUS
approved