This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A002328 M0494 N0179 #47 Jun 05 2025 19:38:32 %S A002328 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, %T A002328 46,47,49,51,54,55,56,57,60,61,65,66,67,69,71,77,84,86,87,90,94,95,97, %U A002328 101,102,104,115,116,121,126,127,131,132,135,139,141,142,145,146,149 %N A002328 Numbers k such that k^2 - k - 1 is prime. %D A002328 D. H. Lehmer, Guide to Tables in the Theory of Numbers. Bulletin No. 105, National Research Council, Washington, DC, 1941, p. 46. %D A002328 L. Poletti, Tavole di Numeri Primi Entro Limiti Diversi e Tavole Affini, Milan, 1920, p. 249. %D A002328 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). %D A002328 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A002328 Carmine Suriano, <a href="/A002328/b002328.txt">Table of n, a(n) for n = 1..60000</a> %F A002328 a(n) = (A088502(n)+1)/2. - _Ray Chandler_ %F A002328 a(n) = A094210(n) + 2. - _R. J. Mathar_, Aug 08 2012 %t A002328 Select[Range[10^3], PrimeQ[#^2 - # - 1] &] (* _Vincenzo Librandi_, Mar 20 2014 *) %o A002328 (Magma) [k: k in [1..300]|IsPrime(k^2-k-1)]; // _Vincenzo Librandi_, Nov 21 2010 %o A002328 (PARI) is(k)=isprime(k^2 - k - 1) \\ _Charles R Greathouse IV_, Apr 28 2015 %Y A002328 Cf. A002327, A088502, A110013. %K A002328 nonn,easy %O A002328 1,1 %A A002328 _N. J. A. Sloane_ %E A002328 Extended by _Ray Chandler_, Sep 07 2005