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 A023216 #21 Sep 08 2022 08:44:47 %S A023216 2,5,7,11,13,23,37,41,43,47,67,71,97,103,113,137,151,163,167,173,181, %T A023216 191,197,211,233,251,263,271,277,293,307,317,397,401,421,431,433,463, %U A023216 467,491,557,571,587,593,607,617,653,683,727,757,811,823,863,877,881,883,887,907 %N A023216 Primes p such that 4*p + 9 is also prime. %H A023216 Vincenzo Librandi, <a href="/A023216/b023216.txt">Table of n, a(n) for n = 1..4000</a> %t A023216 Select[Prime[Range[2000]], PrimeQ[4# + 9]&] (* _Vincenzo Librandi_, Feb 02 2014 *) %o A023216 (Magma) [n: n in [0..1000] | IsPrime(n) and IsPrime(4*n+9)]; // _Vincenzo Librandi_, Nov 19 2010 %K A023216 nonn,easy %O A023216 1,1 %A A023216 _David W. Wilson_