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 A030715 #10 Feb 12 2021 18:02:35 %S A030715 3,11,15,17,25,32,46,61,70,72,73,78,92,96,112,118,142,159,164,166,169, %T A030715 199,221,227,229,233,252,269,301,302,304,308,389,390,396,430,439,490, %U A030715 491,496,552,587,606,607,614,662,671,673,678 %N A030715 Numbers k such that A030707(k) = 3. %Y A030715 Cf. A030707. %K A030715 nonn %O A030715 1,1 %A A030715 _Clark Kimberling_