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 A074628 #19 Jul 14 2020 07:04:28
%S A074628 7,13,19,21,28,31,37,39,43,52,57,61,63,67,73,76,79,84,93,97,103,109,
%T A074628 111,112,117,124,127,129,139,148,151,156,157,163,171,172,175,181,183,
%U A074628 189,193,199,201,208,211,219,223,228,229,237,241,244,252
%N A074628 Numbers k such that sigma(k) == 2 mod 6.
%H A074628 Amiram Eldar, <a href="/A074628/b074628.txt">Table of n, a(n) for n = 1..10000</a>
%F A074628 A000203(n) mod 6 = 2.
%F A074628 {n: A084301(n) = 2}. - _R. J. Mathar_, May 19 2020
%e A074628 For k=39: sigma(39) = 1+3+13+39 = 56 = 6*9 + 2.
%t A074628 Select[Range[300],Mod[DivisorSigma[1,#],6]==2&] (* _Harvey P. Dale_, Nov 14 2014 *)
%o A074628 (PARI) isok(n) = ((sigma(n) % 6) == 2); \\ _Michel Marcus_, Dec 19 2013
%Y A074628 Cf. A000203, A072862, A074384, A074627, A074628, A074629, A074630.
%K A074628 easy,nonn
%O A074628 1,1
%A A074628 _Labos Elemer_, Aug 26 2002