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 A031927 #14 Aug 28 2017 15:23:20
%S A031927 97,367,397,409,457,487,499,691,709,727,751,769,919,937,991,1117,1171,
%T A031927 1201,1381,1447,1531,1567,1579,1741,1831,1987,2011,2161,2221,2251,
%U A031927 2281,2467,2539,2617,2671,2707,2749,2851,2887,2917,3019,3049
%N A031927 Upper prime of a difference of 8 between consecutive primes.
%H A031927 Harvey P. Dale, <a href="/A031927/b031927.txt">Table of n, a(n) for n = 0..1000</a>
%H A031927 <a href="/index/Pri#gaps">Index entries for primes, gaps between</a>
%p A031927 for i from 1 to 440 do if ithprime(i+1) = ithprime(i) + 8 then print({ithprime(i+1)}); fi; od; # _Zerinvary Lajos_, Mar 19 2007
%t A031927 Select[Partition[Prime[Range[500]],2,1],#[[2]]-#[[1]]==8&][[All,2]] (* _Harvey P. Dale_, Aug 28 2017 *)
%K A031927 nonn
%O A031927 0,1
%A A031927 _Jeff Burch_