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 A003523 #18 Oct 21 2023 23:31:32 %S A003523 1,3,11,31,33,93,341,1023 %N A003523 Divisors of 2^10 - 1. %C A003523 Subsequence of A003529, A003538, A003546, A003554. - _Michel Marcus_, May 28 2014 %H A003523 <a href="/index/Di#divisors">Index entries for sequences related to divisors of numbers</a> %t A003523 Divisors[2^10-1] (* _Harvey P. Dale_, Aug 08 2015 *) %o A003523 (PARI) divisors(2^10-1) \\ _Michel Marcus_, May 28 2014 %K A003523 nonn,fini,full,easy %O A003523 1,2 %A A003523 _N. J. A. Sloane_