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 A023229 #25 Sep 08 2022 08:44:47 %S A023229 2,5,7,13,17,31,41,43,47,61,71,73,101,103,107,113,127,131,157,163,181, %T A023229 191,197,223,233,241,251,281,283,293,307,317,337,367,383,421,433,443, %U A023229 457,461,467,491,503,563,631,643,647,653,673,677,691,733,751,761,787,797,811 %N A023229 Primes p such that 8*p + 3 is also prime. %H A023229 Vincenzo Librandi, <a href="/A023229/b023229.txt">Table of n, a(n) for n = 1..1000</a> %p A023229 a := proc (n) if isprime(n) = true and isprime(8*n+3) = true then n else end if end proc: seq(a(n), n = 1 .. 900); # _Emeric Deutsch_, Dec 26 2008 %t A023229 Select[Prime@Range@500, PrimeQ[8 # + 3] &] (* _Vincenzo Librandi_, May 19 2014 *) %o A023229 (Magma) [n: n in PrimesUpTo(1000) | IsPrime(8*n+3)]; // _Vincenzo Librandi_, Nov 20 2010 %Y A023229 Cf. A005124, A007520. %K A023229 nonn,easy %O A023229 1,1 %A A023229 _David W. Wilson_