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 A175528 #9 Mar 30 2012 16:51:57 %S A175528 0,0,1,2,0,1,5,2,1,7,8,7,6,13,13,5,3,1,9,15,7,11,14,13,21,3,10,9,17, %T A175528 13,29,9,16,23,29,28,27,26,4,33,9,16,23,37,10,17,6,16,2,32,49,32,29, %U A175528 46,17,44,43,11,50,58,32,56,10,45,33,61,60,18,67,66,47,1,17,15,22,69,18,61,5,11,73,63,42,40,29,18,7,57,12,46,53,53,49,11,18,40,84,39,37,35 %N A175528 (Digit sum of 13^n) mod n. %H A175528 N. J. A. Sloane, <a href="/A175528/b175528.txt">Table of n, a(n) for n = 1..10000</a> %t A175528 Array[Mod[Total[IntegerDigits[13^#]],#]&, 1000] %Y A175528 Cf. A001022, A175527, A175525. %K A175528 nonn,base %O A175528 1,4 %A A175528 _N. J. A. Sloane_, Dec 03 2010