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 A031302 #6 Jun 26 2022 04:07:42 %S A031302 3,16,36,51,53,55,56,57,59,61,63,65,67,69,76,96,116,136,156,176,199, %T A031302 229,259,281,284,287,289,290,293,296,299,302,305,308,319,349,379,409, %U A031302 439,469,499,529,559,581,584,587,589,590,593,596 %N A031302 Position of n-th 3 in A031298. %Y A031302 Cf. A031298. %K A031302 nonn %O A031302 1,1 %A A031302 _Clark Kimberling_