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 A181597 #20 Oct 07 2019 15:42:34
%S A181597 6,12,88,1888,32128,521728,1848964,8378368,34359083008,549753192448
%N A181597 (N\{4})-perfect numbers, i.e., numbers m for which sigma(m)-4 = 2m, if 4|m, otherwise sigma(m) = 2m.
%C A181597 Or union of {6}, near-perfect numbers m (cf. A181595) for which d(m)=4, and all odd perfect numbers (if they exist). Note that (N\{2})-perfect numbers are numbers for which sigma(m)-2=2m, if m is even, and sigma(m)=2m, if m is odd. They are all even numbers of A045768 and all odd perfect numbers (if they exist).
%e A181597 88 is in the sequence since sigma(88) = 180 and 180 - 4 = 2*88.
%Y A181597 Cf. A000396, A005101, A005820, A088832, A118372, A153501, A181595, A181596.
%K A181597 nonn,more
%O A181597 1,1
%A A181597 _Vladimir Shevelev_, Nov 01 2010, Nov 03 2010
%E A181597 Invalid term removed and a(8)-a(10) from _Donovan Johnson_, Sep 14 2013