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 A018365 #17 Oct 01 2017 00:17:30 %S A018365 1,2,3,5,6,9,10,15,18,27,30,45,54,90,135,270 %N A018365 Divisors of 270. %C A018365 This sequence consists of sixteen integers, which add up to 720. We see that 270 * 16 = 4320, and 4320/720 = 6, which is an integer. Therefore 270 is a harmonic divisor number (A001599), only the second one to be abundant (the first is 140). - _Alonso del Arte_, Sep 30 2017 %H A018365 <a href="/index/Di#divisors">Index entries for sequences related to divisors of numbers</a> %t A018365 Divisors[270] (* _Alonso del Arte_, Sep 30 2017 *) %o A018365 (PARI) divisors(270) \\ _Charles R Greathouse IV_, Jun 21 2017 %K A018365 nonn,fini,full,easy %O A018365 1,2 %A A018365 _N. J. A. Sloane_