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 A030786 #9 Jul 04 2021 13:31:49 %S A030786 14,26,27,36,59,61,63,74,77,90,94,109,112,129,151,157,175,182,202,243, %T A030786 270,277,280,289,308,349,353,359,360,393,401,403,439,443,446,488,540, %U A030786 544,549,598,659,670,722,732,734,741,745,789 %N A030786 Numbers k such that A030777(k) = 4. %Y A030786 Cf. A030777. %K A030786 nonn %O A030786 1,1 %A A030786 _Clark Kimberling_