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 A030540 #5 Apr 03 2023 10:36:09 %S A030540 7,97,983,9871,98731,987361,9876023,98762051,987653201 %N A030540 Largest n-digit norep emirp. %H A030540 C. K. Caldwell, Prime Curios, <a href="https://t5k.org/curios/page.php?curio_id=960">Entry 987653201</a> %Y A030540 Cf. A046732, A031991. %K A030540 nonn,base,fini,full %O A030540 1,1 %A A030540 _Harvey P. Dale_