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 A158238 #7 Mar 24 2015 14:45:51
%S A158238 23,47,863,1103,1439,1583,1823,2879,3359,4943,5279,6719,7823,8783,
%T A158238 9743,11279,11903,12479,13103,16703,18719,19583,20399,20879,21503,
%U A158238 23279,23663,25343,26399,27743,29759,33119,35279,38303,39359,39503,41183
%N A158238 Primes p such that (p-7)/8 and 8p + 7 are both prime.
%H A158238 Harvey P. Dale, <a href="/A158238/b158238.txt">Table of n, a(n) for n = 1..1000</a>
%F A158238 23, (23-7)/8=2, and 8*23+7=191 are all prime.
%t A158238 Select[Prime[Range[5000]],AllTrue[{(#-7)/8,8#+7},PrimeQ]&] (* The program uses the AllTrue function from Mathematica version 10 *) (* _Harvey P. Dale_, Mar 24 2015 *)
%o A158238 (PARI) isok(p) = isprime(p) && isprime(8*p+7) && ((p % 8)==7) && isprime((p-7)/8); \\ _Michel Marcus_, Oct 16 2013
%Y A158238 Cf. A023231 Numbers n such that n and 8n + 7 are both prime.
%K A158238 nonn
%O A158238 1,1
%A A158238 _Zak Seidov_, Mar 14 2009