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 A175457 #11 May 24 2016 09:45:09
%S A175457 0,1,0,2,2,3,1,4,0,6,1,9,10,12,3,6,4,0,6,12,18,19,3,18,15,21,18,6,19,
%T A175457 27,6,30,27,33,30,18,24,21,6,11,3,27,24,21,27,42,21,9,15,21,12,15,4,9,
%U A175457 52,50,27,55,48,3,24,39,36,60,10,27,33,3,36,42,66,54,33,57,63,51,75,36,51,39,45,60,1,27,15,21,27,15,48,0,69,84,27,51,39,54,94,66,45,42
%N A175457 (Digit sum of 6^n) mod n.
%t A175457 Table[Mod[Total[IntegerDigits[6^n]],n],{n,120}] (* _Harvey P. Dale_, May 24 2016 *)
%Y A175457 Cf. A000400, A066002, A067864.
%K A175457 nonn,base
%O A175457 1,4
%A A175457 _N. J. A. Sloane_, Dec 03 2010
%E A175457 Corrected by _N. J. A. Sloane_, May 23 2016 at the suggestion of _Harvey P. Dale_.