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 A153047 #24 Sep 08 2022 08:45:39 %S A153047 12,15,18,20,21,24,25,27,30,32,33,35,36,39,40,42,45,46,48,50,51,53,54, %T A153047 55,57,60,63,65,66,67,68,69,70,72,74,75,78,79,80,81,84,85,87,88,90,92, %U A153047 93,95,96,99,100,101,102,105,108,109,110,111,112,114,115,116 %N A153047 Numbers n such that 2*n-15 is not a prime. %C A153047 One more than the associated entry in A153049. - _R. J. Mathar_, Jan 05 2011 %C A153047 The terms are the values of 2*h*k + k + h + 8, where h and k are positive integers.- _Vincenzo Librandi_, Jan 19 2013 %H A153047 Vincenzo Librandi, <a href="/A153047/b153047.txt">Table of n, a(n) for n = 1..1000</a> %t A153047 Select[Range[12,200], !PrimeQ[2*#-15]&] (* _Vladimir Joseph Stephan Orlovsky_, Feb 09 2012 *) %o A153047 (Magma) [n: n in [10..120] | not IsPrime(2*n - 15)]; // _Vincenzo Librandi_, Oct 11 2012 %Y A153047 Cf. A097480, A153043, A153045, A153049, A163657. %K A153047 nonn,easy %O A153047 1,1 %A A153047 _Vincenzo Librandi_, Dec 17 2008