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 A027897 #29 Jul 08 2025 17:57:51 %S A027897 1,3,7,9,11,13,21,27,33,37,39,63,77,91,99,101,111,117,143,189,231,259, %T A027897 273,297,303,333,351,407,429,481,693,707,777,819,909,999,1001,1111, %U A027897 1221,1287,1313,1443,2079,2121,2331,2457,2727,2849,3003,3333,3367 %N A027897 Divisors of 10^12 - 1. %H A027897 Nathaniel Johnston, <a href="/A027897/b027897.txt">Table of n, a(n) for n = 1..256</a> (full sequence) %H A027897 <a href="/index/Di#divisors">Index entries for sequences related to divisors of numbers</a> %t A027897 Divisors[10^12 - 1] (* _Paolo Xausa_, Jul 01 2024 *) %o A027897 (PARI) divisors(10^12-1) \\ _Charles R Greathouse IV_, Jun 21 2017 %Y A027897 Cf. A027890-A027896, A027898. %K A027897 nonn,fini,full,easy %O A027897 1,2 %A A027897 _N. J. A. Sloane_ %E A027897 Offset corrected by _Nathaniel Johnston_, May 17 2011