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%I #7 Mar 30 2012 17:24:46
%S 1,3,5,7,8,9,11,13,14,15,16,17,19,20,21,22,23,24,25,26,27,29,31,32,33,
%T 34,35,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,55,56,57,58,
%U 59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76
%N Numbers that are not the sum of two powers of 3.
%C Complement of A055235 (sums of two powers of 3)
%e a(2)=3 because 3 cannot be expressed as the sum of two powers of 3
%Y Cf. A055235, A072823.
%K nonn
%O 1,2
%A _Jeremy Gardiner_, Oct 08 2011
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