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 A100458 #8 Jan 31 2023 12:29:46 %S A100458 3,7,13,19,27,35,59,127,181,1063,28573 %N A100458 Values of n for which the decimal number 10...080...01 is an n-digit prime. %C A100458 a(12) > 54647. - _Robert Price_, Apr 14 2013 %Y A100458 Cf. A100028. %K A100458 nonn,base,more %O A100458 1,1 %A A100458 Harvey Dubner (harvey(AT)dubner.com), Nov 23 2004