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 A053179 #8 Dec 16 2021 22:15:44 %S A053179 33,63,93,123,133,143,153,183,203,213,243,253,273,303,323,333,343,363, %T A053179 393,403,413,423,453,473,483,493,513,533,543,553,573,583,603,623,633, %U A053179 663,693,703,713,723,753,763,783,793,803,813,833,843,873,893,903,913 %N A053179 Numbers ending in 3 which are not prime. %Y A053179 Cf. A030431. %K A053179 easy,nonn,base %O A053179 1,1 %A A053179 _Enoch Haga_, Feb 29 2000 %E A053179 Terms corrected by _Sean A. Irvine_, Dec 16 2021