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 A002328 Numbers n such that n^2 - n - 1 is prime. (Formerly M0494 N0179) 29
 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; text; internal format)
 OFFSET 1,1 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). LINKS Carmine Suriano, Table of n, a(n) for n = 1..60000 FORMULA a(n) = (A088502(n)+1)/2. - Ray Chandler a(n) = A094210(n)+2. - R. J. Mathar, Aug 08 2012 MATHEMATICA lst={}; Do[If[PrimeQ[n^2-n-1], AppendTo[lst, n]], {n, 10^5}]; lst (* Vladimir Joseph Stephan Orlovsky, Aug 21 2008 *) Select[Range[10^3], PrimeQ[#^2 - # - 1] &] (* Vincenzo Librandi, Mar 20 2014 *) PROG (MAGMA) [n: n in [1..300]|IsPrime(n^2-n-1)]; // Vincenzo Librandi, Nov 21 2010 (PARI) is(n)=isprime(n^2 - n - 1) \\ Charles R Greathouse IV, Apr 28 2015 CROSSREFS Cf. A002327, A088502, A110013. Sequence in context: A184518 A304802 A288228 * A039133 A113777 A285659 Adjacent sequences:  A002325 A002326 A002327 * A002329 A002330 A002331 KEYWORD nonn,easy AUTHOR EXTENSIONS Extended by Ray Chandler, Sep 07 2005 STATUS approved

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Last modified August 25 03:10 EDT 2019. Contains 326318 sequences. (Running on oeis4.)