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 A227986 #9 Aug 03 2013 10:07:41 %S A227986 13,35,85,91,119,185,255,245,255,313,455,481,425,455,629,559,841,845, %T A227986 741,765,1183,841,793,1355,1015,833,935,1295,1547,1105,1443,1505,1445, %U A227986 2197,1785,1799,2735,2041,3315,2405,2135,2523,3523,2873,2755,3605,2191,4165 %N A227986 Antiharmonic mean of the divisors of A227771(n) (the n-th antiharmonic number that is not a square). %C A227986 For comments, references, example, and crossrefs, see A227771. %H A227986 Charles R Greathouse IV, <a href="/A227986/b227986.txt">Table of n, a(n) for n = 1..10000</a> %F A227986 a(n) = sigma_2(A227771(n))/sigma_1(A227771(n)). %Y A227986 Cf. A227771, A176797. %K A227986 nonn %O A227986 1,1 %A A227986 _Jonathan Sondow_, Aug 02 2013