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 A018339 #19 Jul 08 2025 06:40:09 %S A018339 1,2,4,5,10,11,20,22,44,55,110,220 %N A018339 Divisors of 220. %C A018339 This number has twelve divisors that add up to 504, and 504 - 220 = 284, so 220 is an abundant number. In turn, 284 is a deficient number with six divisors (see A018373) which also add up to 504, and 504 - 284 = 220. - _Alonso del Arte_, Oct 22 2017 %H A018339 <a href="/index/Di#divisors">Index entries for sequences related to divisors of numbers</a> %t A018339 Divisors[220] (* _Alonso del Arte_, Oct 22 2017 *) %o A018339 (PARI) divisors(220) \\ _Charles R Greathouse IV_, Jun 22 2017 %Y A018339 Cf. A063990, A259180. %K A018339 nonn,fini,full,easy %O A018339 1,2 %A A018339 _N. J. A. Sloane_