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 A097011 #13 Jan 10 2017 07:52:26
%S A097011 1,3,4,7,6,12,8,15,13,18,12,28,14,24,24,1,18,9,20,12,2,6,24,0,1,12,10,
%T A097011 26,0,12,2,3,18,24,18,1,8,0,26,0,12,6,14,24,18,12,18,4,27,3,12,8,24,0,
%U A097011 12,0,20,0,0,18,2,6,14,7,24,24,8,6,6,24,12,15,14,24,4,20,6,18,20,6,1,6
%N A097011 Remainder of sigma(n) modulo 30.
%H A097011 Indranil Ghosh, <a href="/A097011/b097011.txt">Table of n, a(n) for n = 1..10000</a>
%F A097011 a(n) = mod(A000203(n), 30).
%t A097011 Table[Mod[DivisorSigma[1, n], 30], {n, 120}] (* _Michael De Vlieger_, Jan 10 2017 *)
%o A097011 (PARI) a(n) = sigma(n) % 30; \\ _Michel Marcus_, Dec 19 2013
%Y A097011 Cf. A084301, A084303, A000203, A097012, A097013, A097014, A097015.
%K A097011 nonn
%O A097011 1,2
%A A097011 _Labos Elemer_, Aug 19 2004