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 A089530 #8 Sep 08 2022 08:45:12 %S A089530 1,3,4,6,7,8,10,14,15,16,19,21,24,25,30,31,33,34,37,39,40,44,45,46,48, %T A089530 49,50,57,59,61,63,68,70,71,75,76,78,80,85,90,91,93,96,97,99,101,102, %U A089530 103,109,111,112,113,117,118,120,131,132,137,139,140,144,147,149,154 %N A089530 A023204 indexed by A000040. %H A089530 Vincenzo Librandi, <a href="/A089530/b089530.txt">Table of n, a(n) for n = 1..1000</a> %F A089530 a(n)=k such that A023204(n)=A000040(k). %t A089530 Select[Range[160], PrimeQ[2 Prime[#] + 3] &] (* _Vincenzo Librandi_, May 02 2016 *) %o A089530 (Magma) [n: n in [1..250] | IsPrime(2*NthPrime(n)+3)]; // _Vincenzo Librandi_, May 02 2016 %Y A089530 Cf. A023204, A089531, A089532. %K A089530 nonn,easy %O A089530 1,2 %A A089530 _Ray Chandler_, Nov 07 2003