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 A088829 #8 Sep 21 2019 06:55:18
%S A088829 6,10,12,14,20,22,24,26,28,30,34,38,40,42,44,46,48,52,54,56,58,60,62,
%T A088829 66,68,70,74,76,78,80,82,84,86,88,90,92,94,96,102,104,106,108,110,112,
%U A088829 114,116,118,120,122,124,126,130,132,134,136,138,140,142,146,148,150,152
%N A088829 Even numbers with even abundance.
%C A088829 Odd numbers with odd abundance are in A016754. Odd numbers with even abundance are in A088828. Even numbers with odd abundance are in A088827.
%H A088829 Amiram Eldar, <a href="/A088829/b088829.txt">Table of n, a(n) for n = 1..10000</a>
%e A088829 Even perfect numbers are here.
%e A088829 n=10: sigma[10]=18, abundance=18-20=-2<0;
%e A088829 n=12: sigma[12]=28, abundance=28-24=+4>0.
%e A088829 sigma[n] is also even number; sign of abundance:<=>0.
%t A088829 Do[s=DivisorSigma[1, n]-2*n; If[ !OddQ[s]&&!OddQ[n], Print[{n, s}]], {n, 1, 1000}]
%Y A088829 Cf. A016754, A088827-A088828, A088830.
%K A088829 nonn
%O A088829 1,1
%A A088829 _Labos Elemer_, Oct 28 2003