%I A162228
%S A162228 0,1,2,3,4,5,6,9,10,16,25,32,45,65,133,134,152,250,1542,3190,3222,3612,
%T A162228 3613,4183,9286,35411,37271,72865,191334,193393,376889,535069,794376,
%U A162228 1110699,2236488,3021897,4431562,8094840,9885773,10883814,16219922
%N A162228 Base 7 perfect digital invariants (written in base 10): numbers equal 
               to the sum of the kth powers of their base-7 digits, for some k.
%H A162228 Joseph Myers, <a href="b162228.txt">Table of n, a(n) for n=1..868</a> 
               (complete to 200 base 7 digits)
%Y A162228 Cf. A162229 (corresponding exponents), A010350 (restriction to power 
               = number of digits), A033839, A162230. In other bases: A162216 (base 
               3), A162219 (base 4), A162222 (base 5), A162225 (base 6), A162231 
               (base 8), A162234 (base 9), A023052 (base 10).
%Y A162228 Sequence in context: A082642 A153013 A052492 this_sequence A085714 A116546 
               A108957
%Y A162228 Adjacent sequences: A162225 A162226 A162227 this_sequence A162229 A162230 
               A162231
%K A162228 base,nonn
%O A162228 1,3
%A A162228 Joseph Myers (jsm(AT)polyomino.org.uk), Jun 28 2009