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 A277724 #7 Oct 30 2016 13:38:58 %S A277724 0,3,16,20,23,27,33,40,47,57,60,64,71,77,84,91,101,104,108,115,121, %T A277724 125,128,145,148,152,158,165,169,172,182,189,196,202,206,209,213,226, %U A277724 233,240,246,250,253,257,263,270,274,277,290,294,297,301,307,314,321,331,334,338,345,351,358,375,378,382 %N A277724 Intersection of A158919 and A277722. %C A277724 See A277728 for discussion. %Y A277724 Cf. A003144, A003145, A003146, A058265, A158919, A275926, A276799, A276800, A277722, A277723, A277724, A277725, A277726, A277727, A277728. %K A277724 nonn %O A277724 1,2 %A A277724 _N. J. A. Sloane_, Oct 30 2016