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 A093974 #11 Aug 14 2018 21:00:51 %S A093974 0,0,0,0,28,424,5318,60761,648780,6576432,64778166,626694626, %T A093974 5994718578,56938020205,538418118750,5078038454782,47824516913862, %U A093974 450132198653881 %N A093974 Number of prime pairs below 10^n having a difference of 40. %H A093974 Siegfried "Zig" Herzog, <a href="http://zigherzog.net/primes/index.html#compare">Frequency of Occurrence of Prime Gaps</a> %H A093974 T. Oliveira e Silva, S. Herzog, and S. Pardi, <a href="http://dx.doi.org/10.1090/S0025-5718-2013-02787-1">Empirical verification of the even Goldbach conjecture and computation of prime gaps up to 4.10^18</a>, Math. Comp., 83 (2014), 2033-2060. %e A093974 a(5) = 28 because there are 28 prime gaps of 40 below 10^5. %Y A093974 Cf. A007508, A093973, A093975. %K A093974 nonn,more %O A093974 1,5 %A A093974 _Enoch Haga_, Apr 24 2004 %E A093974 a(10)-a(13) from _Washington Bomfim_, Jun 22 2012 %E A093974 a(14)-a(18) from S. Herzog's website added by _Giovanni Resta_, Aug 14 2018