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 A227306 #20 Aug 16 2021 21:35:45
%S A227306 2,6,34,50,216,236,262,386,898,924,945,1456,2380,5356,6468,6624,8362,
%T A227306 14100,23496,26938,46594,80876,196344,212796,1661136,4070200,4160920,
%U A227306 4626700,5244548,5462384,17062316,60464628,217408416,248621604,262792908,265371336,323987588
%N A227306 Numbers k that divide sigma(k) + sigma(k-1).
%C A227306 Is 945 the only odd term? - _Zak Seidov_, Jul 06 2013
%C A227306 945 and 19910536425 are the only odd terms below 2^36. - _Alex Ratushnyak_, Jul 08 2013
%C A227306 The third odd term is a(58) = 841488503841. - _Giovanni Resta_, Apr 04 2014
%H A227306 Giovanni Resta, <a href="/A227306/b227306.txt">Table of n, a(n) for n = 1..65</a> (terms < 10^13)
%t A227306 With[{nn=324*10^6},Select[Thread[{Total/@Partition[DivisorSigma[ 1,Range[ nn]],2,1],Range[ 2,nn]}],Divisible[#[[1]],#[[2]]]&][[All,2]]] (* _Harvey P. Dale_, May 29 2020 *)
%Y A227306 Cf. A000203, A092403, A007691, A068078, A186103, A072188.
%K A227306 nonn
%O A227306 1,1
%A A227306 _Alex Ratushnyak_, Jul 05 2013