%I A162216
%S A162216 0,1,2,5,8,17,33,34,65,66,67,131,258,259,386,512,513,514,1026,1027,2049,
%T A162216 2050,3075,3076,4100,16388,16389,16390,57345,57346,65538,65539,196610,
%U A162216 262149,262150,458754,458755,786438,786439,1048581,1048582,1310724
%N A162216 Base 3 perfect digital invariants (written in base 10): numbers equal 
               to the sum of the kth powers of their base-3 digits, for some k.
%H A162216 Joseph Myers, <a href="b162216.txt">Table of n, a(n) for n=1..6130</a> 
               (complete to 2000 base 3 digits)
%Y A162216 Cf. A162217 (corresponding exponents), A033835, A162218. In other bases: 
               A162219 (base 4), A162222 (base 5), A162225 (base 6), A162228 (base 
               7), A162231 (base 8), A162234 (base 9), A023052 (base 10).
%Y A162216 Sequence in context: A054754 A054755 A093331 this_sequence A032158 A103745 
               A112361
%Y A162216 Adjacent sequences: A162213 A162214 A162215 this_sequence A162217 A162218 
               A162219
%K A162216 base,nonn
%O A162216 1,3
%A A162216 Joseph Myers (jsm(AT)polyomino.org.uk), Jun 28 2009