%I A031176
%S A031176 1,1,8,8,8,8,8,1,8,8,1,8,8,1,8,8,8,8,8,1,8,8,8,1,8,8,8,8,1,8,8,1,1,8,8,
%T A031176 8,8,8,8,8,8,8,8,8,1,8,8,8,8,1,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,1,8,
%U A031176 1,8,8,8,8,8,8,8,8,1,8,8,1,8,8,8,1,8,8,8,8,1,8,8,1,8,8,1,8,8
%N A031176 Periods of sum of squares of digits iterated until the sequence becomes 
               periodic.
%H A031176 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               Digitaddition.html">Link to a section of The World of Mathematics.</
               a>
%Y A031176 Cf. A003132, A099645. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), 
               May 31 2009]
%Y A031176 Sequence in context: A023414 A125555 A010531 this_sequence A010731 A048762 
               A160949
%Y A031176 Adjacent sequences: A031173 A031174 A031175 this_sequence A031177 A031178 
               A031179
%K A031176 nonn,base
%O A031176 0,3
%A A031176 Eric Weisstein (eric(AT)weisstein.com)
%E A031176 The value a(0)=1 was added by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), 
               May 31 2009