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 A030764 #8 Feb 12 2021 20:09:17 %S A030764 7,10,15,21,29,38,50,54,55,57,65,69,82,85,100,122,126,127,130,146,173, %T A030764 175,177,182,203,219,237,239,241,242,249,273,312,316,317,327,354,359, %U A030764 400,403,404,411,448,500,505,506,524,557,561 %N A030764 Numbers k such that A030757(k) = 2. %Y A030764 Cf. A030757. %K A030764 nonn %O A030764 1,1 %A A030764 _Clark Kimberling_