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A227518
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Values of n such that L(15) and N(15) 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.
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1
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9, 25, 39, -105, 105, -107, 235, 313, 397, 415, -471, 639, -773, -885, 919, 957, -1053, -1115, -1151, 1279, -1325, 1327, -1377, 1563, -1641, -1703, -1811, -1851, 2007, 2023, -2441, -2501, 2553, -2621, -2681, 2685, -2691, 2937, -2943, -3047, -3491, 3493, 3603, -3677, 3733, -3965, 4083, 4317, -4623, -4737, -4805, -5043, -5063, -5481, -5757, 5805, 5947
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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Computed with PARI using commands similar to those used to compute A226921.
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LINKS
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Vincenzo Librandi and Joerg Arndt, Table of n, a(n) for n = 1..1000
Eric L. F. Roettger, A cubic extension of the Lucas functions, Thesis, Dept. of Mathematics and Statistics, Univ. of Calgary, 2009. See page 195.
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CROSSREFS
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Cf. A226921-A226929, A227448, A227449, A227515-A227523.
Sequence in context: A241764 A044451 A114057 * A031036 A348749 A291259
Adjacent sequences: A227515 A227516 A227517 * A227519 A227520 A227521
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KEYWORD
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sign,easy
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AUTHOR
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Vincenzo Librandi, Jul 14 2013
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STATUS
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approved
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