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 A124850 #6 Mar 10 2022 18:56:10
%S A124850 2,5,11,17,29,37,61,67,71,89,167,191,199,229,269,277,311,331,337,347,
%T A124850 379,389,419,431,509,541,577,587,617,631,691,709,757,797,809,821,929,
%U A124850 941,977,991,1069,1091,1117,1129,1217,1277,1279,1289,1291,1367,1439
%N A124850 Primes p=n/2 such that 7n+3 and 3n+7 are primes.
%H A124850 Harvey P. Dale, <a href="/A124850/b124850.txt">Table of n, a(n) for n = 1..1000</a>
%t A124850 Select[Prime[Range[250]],AllTrue[{14#+3,6#+7},PrimeQ]&] (* _Harvey P. Dale_, Mar 10 2022 *)
%Y A124850 Cf. A089033, A089953, A124849.
%K A124850 nonn
%O A124850 1,1
%A A124850 _Zak Seidov_, Nov 10 2006