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A002328
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Numbers n such that n^2 - n - 1 is prime.
(Formerly M0494 N0179)
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19
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3, 4, 5, 6, 7, 9, 10, 11, 12, 14, 16, 17, 20, 21, 22, 25, 27, 29, 31, 32, 36, 39, 40, 42, 45, 46, 47, 49, 51, 54, 55, 56, 57, 60, 61, 65, 66, 67, 69, 71, 77, 84, 86, 87, 90, 94, 95, 97, 101, 102, 104, 115, 116, 121, 126, 127, 131, 132, 135, 139, 141, 142, 145, 146, 149
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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REFERENCES
| D. H. Lehmer, Guide to Tables in the Theory of Numbers. Bulletin No. 105, National Research Council, Washington, DC, 1941, p. 46.
L. Poletti, Tavole di Numeri Primi Entro Limiti Diversi e Tavole Affini, Milan, 1920, p. 249.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
| Carmine Suriano, Table of n, a(n) for n = 1..60000
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FORMULA
| a(n) = (A088502(n)+1)/2. - Chandler
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MATHEMATICA
| lst={}; Do[If[PrimeQ[n^2-n-1], AppendTo[lst, n]], {n, 10^5}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Aug 21 2008]
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PROG
| (MAGMA)[ n: n in [1..300]|IsPrime(n^2-n-1)] [From V.Librandi, Nov 21 2010]
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CROSSREFS
| Cf. A002327, A088502, A110013.
Sequence in context: A039235 A039179 A184518 * A039133 A113777 A039096
Adjacent sequences: A002325 A002326 A002327 * A002329 A002330 A002331
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Sep 07 2005
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