Search: id:A055040
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%I A055040
%S A055040 6,15,24,33,42,51,54,60,69,78,87,96,105,114,123,132,135,141,150,
%T A055040 159,168,177,186,195,204,213,216,222,231,240,249,258,267,276,285,
%U A055040 294,297,303,312,321,330,339,348,357,366,375,378,384,393,402,411
%N A055040 Numbers of the form 3^(2i+1)*(3*j+2).
%C A055040 Numbers not of the form x^2+y^2+3z^2.
%D A055040 L. J. Mordell, A new Waring's problem with squares of linear forms, Quart. 
               J. Math., 1 (1930), 276-288 (see p. 283).
%F A055040 G.f.: [x(x+2)(x^2+x+1)(x^7+x^3+1)]/(x^11-x^10-x+1) (conjectured).
%Y A055040 Equals 3*A055048(n).
%Y A055040 Sequence in context: A095032 A161925 A043477 this_sequence A017233 A122709 
               A052220
%Y A055040 Adjacent sequences: A055037 A055038 A055039 this_sequence A055041 A055042 
               A055043
%K A055040 nonn,nice
%O A055040 1,1
%A A055040 N. J. A. Sloane (njas(AT)research.att.com), Jun 01 2000

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