%I A162231
%S A162231 0,1,2,3,4,5,6,7,16,17,20,52,92,128,129,133,256,257,272,273,307,432,433,
%T A162231 1024,1025,1056,1057,2323,8192,8193,13379,16384,16385,16512,16513,16819,
%U A162231 17864,17865,24583,25639,65536,65537,65792,65793,212419,524288,524289
%N A162231 Base 8 perfect digital invariants (written in base 10): numbers equal 
               to the sum of the kth powers of their base-8 digits, for some k.
%H A162231 Joseph Myers, <a href="b162231.txt">Table of n, a(n) for n=1..1130</a> 
               (complete to 160 base 8 digits)
%Y A162231 Cf. A162232 (corresponding exponents), A010354 (restriction to power 
               = number of digits), A033840, A162233. In other bases: A162216 (base 
               3), A162219 (base 4), A162222 (base 5), A162225 (base 6), A162228 
               (base 7), A162234 (base 9), A023052 (base 10).
%Y A162231 Sequence in context: A161673 A004836 A039030 this_sequence A132028 A069188 
               A085158
%Y A162231 Adjacent sequences: A162228 A162229 A162230 this_sequence A162232 A162233 
               A162234
%K A162231 base,nonn
%O A162231 1,3
%A A162231 Joseph Myers (jsm(AT)polyomino.org.uk), Jun 28 2009