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 A123997 #12 Mar 28 2020 04:28:14
%S A123997 1,133,166,208,313,418,616,691,718,1336,1441,1573,1588,1756,2083,2308,
%T A123997 2533,2926,2986,3688,3766,3883,4036,4096,4201,4663,5311,5626,5908,
%U A123997 6181,7018,7456,7771,7798,8188,8881,9196,9343,9388,9826,10108,10123,10528
%N A123997 Numbers k for which 16*k+1, 16*k+3 and 16*k+15 are primes.
%H A123997 Amiram Eldar, <a href="/A123997/b123997.txt">Table of n, a(n) for n = 1..10000</a>
%t A123997 Select[Range[11000], And @@ PrimeQ /@ ({1, 3, 15} + 16#) &] (* _Ray Chandler_, Nov 05 2006 *)
%Y A123997 Cf. A092022.
%K A123997 nonn
%O A123997 1,2
%A A123997 _Artur Jasinski_, Oct 31 2006
%E A123997 Extended by _Ray Chandler_, Nov 05 2006