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 A354038 #7 May 16 2022 17:26:09
%S A354038 1,9,10,12,24,26,28,34,44,48,49,56,58,60,74,76,81,82,84,88,90,92,96,
%T A354038 106,108,112,120,121,122,124,132,140,146,152,156,168,172,176,178,184,
%U A354038 188,192,194,202,204,216,218,220,224,226,228,234,236,240,248,252,260,264,268,274,276,280,284,298,300,304,306,308
%N A354038 Numbers k such that sum of the proper divisors of k is a multiple of 4.
%C A354038 Numbers k for which A001065(k) = 4*m for some m.
%H A354038 <a href="/index/Si#SIGMAN">Index entries for sequences related to sigma(n)</a>
%F A354038 {k | A010873(k) == A105824(k)}.
%t A354038 Select[Range[300], Divisible[DivisorSigma[1, #] - #, 4] &] (* _Amiram Eldar_, May 16 2022 *)
%o A354038 (PARI)
%o A354038 A354037(n) = (0==((sigma(n)-n)%4));
%o A354038 isA354038(n) = A354037(n);
%Y A354038 Cf. A000203, A001065, A010873, A105824, A354037 (characteristic function).
%K A354038 nonn
%O A354038 1,2
%A A354038 _Antti Karttunen_, May 16 2022