%I A031177
%S A031177 2,3,4,5,6,8,9,11,12,14,15,16,17,18,20,21,22,24,25,26,27,29,30,33,
%T A031177 34,35,36,37,38,39,40,41,42,43,45,46,47,48,50,51,52,53,54,55,56,57,
%U A031177 58,59,60,61,62,63,64,65,66,67,69,71,72,73,74,75,76,77,78,80,81,83
%N A031177 Numbers having period-8 2-digitized sequences.
%C A031177 Also known as unhappy numbers. - Gerard Schildberger (gerards(AT)rrt.net), 
               Jun 05 2004
%H A031177 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               Digitaddition.html">Link to a section of The World of Mathematics.</
               a>
%H A031177 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               UnhappyNumber.html">Unhappy Number</a>
%Y A031177 Complement of happy numbers A007770. Cf. A056527.
%Y A031177 Sequence in context: A066022 A052047 A078831 this_sequence A164119 A033102 
               A030749
%Y A031177 Adjacent sequences: A031174 A031175 A031176 this_sequence A031178 A031179 
               A031180
%K A031177 nonn
%O A031177 0,1
%A A031177 Eric Weisstein (eric(AT)weisstein.com)