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 A236562 #19 Oct 14 2015 12:46:33
%S A236562 0,1,2,3,4,5,6,9,10,11,12,14,15,16,17,18,21,22,23,26,27,29,30,31,32,
%T A236562 34,35,38,39,41,42,44,45,46,47,48,51,53,54,57,58,59,60,61,62,65,69,70,
%U A236562 71,72,73,76,77,78,80,81,82,83,84,86,87,89,90,91,92,93,94
%N A236562 Numbers n such that A049820(x) = n has a solution.
%C A236562 Complement of A045765.
%H A236562 Jaroslav Krizek, <a href="/A236562/b236562.txt">Table of n, a(n) for n = 1..10000</a>
%F A236562 A060990(a(n)) > 0.
%e A236562 10 is in sequence because A049820(14) = 14 - A000005(14) = 14 - 4 = 10.
%t A236562 Take[Sort@ DeleteDuplicates@ Table[n - DivisorSigma[0, n], {n, 1200}], 67] (* _Michael De Vlieger_, Oct 13 2015 *)
%Y A236562 Cf. A049820, A236561, A236565.
%K A236562 nonn
%O A236562 1,3
%A A236562 _Jaroslav Krizek_, Feb 09 2014