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 A275519 #6 Jan 19 2019 04:15:43 %S A275519 1,9,3,4,9,6,4,2,5,2 %N A275519 Decimal expansion of sum of reciprocals of all prime triples. %H A275519 Wikipedia, <a href="https://en.wikipedia.org/wiki/Prime_triple">Prime triple</a> %F A275519 Equals 1.934964252... = (1/5 + 1/7 + 1/11) + (1/7 + 1/11 + 1/13) + (1/11 + 1/13 + 1/17) + .... %e A275519 1.934964252.... %Y A275519 Cf. A275515, A275516. %K A275519 nonn,cons,more %O A275519 1,2 %A A275519 _Arkadiusz Wesolowski_, Jul 31 2016