%I A004159
%S A004159 0,1,4,9,7,7,9,13,10,9,1,4,9,16,16,9,13,19,9,10,4,9,16,16,18,13,19,18,
               19,
%T A004159 13,9,16,7,18,13,10,18,19,13,9,7,16,18,22,19,9,10,13,9,7,7,9,13,19,18,
               10,
%U A004159 13,18,16,16,9,13,19,27,19,13,18,25,16,18,13,10,18,19,22,18,25,25,18,13
%N A004159 Sum of digits of n^2.
%C A004159 a(n)=A007953(A000290(n)); a(A058369(n))=A007953(A058369(n)). [From Reinhard 
               Zumkeller (reinhard.zumkeller(AT)gmail.com), Apr 25 2009]
%H A004159 Zak Seidov, <a href="b004159.txt">Table of n, a(n) for n=0..10000</a>
%Y A004159 Sequence in context: A166923 A021205 A056992 this_sequence A092554 A155787 
               A123157
%Y A004159 Adjacent sequences: A004156 A004157 A004158 this_sequence A004160 A004161 
               A004162
%K A004159 nonn,base
%O A004159 0,3
%A A004159 N. J. A. Sloane (njas(AT)research.att.com).