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 A109933 #13 Jun 21 2017 22:03:26 %S A109933 1,3,9,53,79,159,237,477,711,4187,12561,37683,265371653,796114959, %T A109933 2388344877,14064697609,20964360587,42194092827,62893081761, %U A109933 126582278481,188679245283,1111111111111,3333333333333,9999999999999 %N A109933 Divisors of 10^13 - 1. %H A109933 <a href="/index/Di#divisors">Index entries for sequences related to divisors of numbers</a> %t A109933 Divisors[10^13 - 1] (* _Wesley Ivan Hurt_, Feb 14 2014 *) %o A109933 (PARI) divisors(10^13-1) \\ _Charles R Greathouse IV_, Jun 21 2017 %Y A109933 Cf. A018282, A018766, A027894, A027893, A027892, A027891, A027890, A027889, A027895, A027896, A027897, A001270, A007138, A046107. %K A109933 nonn,fini,full,easy %O A109933 1,2 %A A109933 Douglas Winston (douglas.winston(AT)srupc.com), Oct 11 2005