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 A030775 #8 Feb 12 2021 20:08:22 %S A030775 6,12,27,37,47,60,75,93,94,98,113,114,132,134,135,155,157,215,244,247, %T A030775 255,258,278,299,315,357,361,403,408,411,453,457,509,562,567,574,576, %U A030775 618,624,677,684,741,745,750,811,816,821,832 %N A030775 Numbers k such that A030767(k) = 3. %Y A030775 Cf. A030767. %K A030775 nonn %O A030775 1,1 %A A030775 _Clark Kimberling_