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 A027891 #15 Jul 08 2025 17:57:24 %S A027891 1,3,9,239,717,2151,4649,13947,41841,1111111,3333333,9999999 %N A027891 Divisors of 9999999. %H A027891 <a href="/index/Di#divisors">Index entries for sequences related to divisors of numbers</a> %t A027891 Divisors[9999999] (* _Harvey P. Dale_, Nov 15 2019 *) %o A027891 (PARI) divisors(9999999) \\ _Charles R Greathouse IV_, Jun 21 2017 %K A027891 nonn,fini,full,easy %O A027891 1,2 %A A027891 _N. J. A. Sloane_