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 A123990 #10 Mar 28 2020 04:28:08
%S A123990 1,7771,18166,21691,26146,26356,46801,69046,75916,91516,111406,122716,
%T A123990 156196,171436,175726,177316,201571,219316,222706,259951,282826,
%U A123990 355531,426796,433621,435301,438976,440056,524371,560461,585166,605506,608026
%N A123990 Numbers k for which 16*k+1, 16*k+3, 16*k+7, 16*k+13 and 16*k+15 are primes.
%H A123990 Amiram Eldar, <a href="/A123990/b123990.txt">Table of n, a(n) for n = 1..10000</a>
%t A123990 Select[Range[10^6], And @@ PrimeQ /@ ({1, 3, 7, 13, 15} + 16#) &] (* _Ray Chandler_, Dec 06 2006 *)
%Y A123990 Cf. A092022.
%K A123990 nonn
%O A123990 1,2
%A A123990 _Artur Jasinski_, Oct 30 2006