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 A156287 #14 Sep 08 2022 08:45:41 %S A156287 2,3,4,6,7,9,12,13,16,18,19,21,22,27,28,33,34,36,39,42,43,46,49,51,54, %T A156287 57,58,61,64,67,69,72,78,79,84,88,91,93,96,97,106,109,111,112,117,118, %U A156287 121,123,124,126,127,132,138,142,144,148,151,153,156,159,162,163,166 %N A156287 Numbers k such that 4*k-5 is a prime number. %C A156287 Two more than the associated A095278, one more than the associated A005099. - _R. J. Mathar_, Jan 05 2011 %H A156287 Vincenzo Librandi, <a href="/A156287/b156287.txt">Table of n, a(n) for n = 1..1000</a> %t A156287 Select[Range[600], PrimeQ[4 # - 5]&] (* _Vincenzo Librandi_, Feb 16 2013 *) %o A156287 (Magma) [n: n in [1..400] | IsPrime(4*n - 5)]; // _Vincenzo Librandi_, Feb 16 2013 %Y A156287 Cf. A156288, A005099, A095278. %K A156287 nonn,easy %O A156287 1,1 %A A156287 _Vincenzo Librandi_, Feb 07 2009