Search: id:A000049
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%I A000049 M0714 N0264
%S A000049 0,0,2,3,5,9,16,29,53,98,181,341,640,1218,2321,4449,8546,16482,31845,61707,
%T A000049 119760,232865,453511,884493,1727125,3376376,6607207,12941838,25371086,
               49776945,
%U A000049 97730393,192009517,377473965,742511438,1461351029,2877568839,5668961811
%N A000049 Number of positive integers <= 2^n of form 3 x^2 + 4 y^2.
%D A000049 D. Shanks and L. P. Schmid, Variations on a theorem of Landau. Part I, 
               Math. Comp., 20 (1966), 551-569.
%D A000049 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A000049 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%H A000049 <a href="Sindx_Qua.html#quadpop">Index entries for sequences related 
               to populations of quadratic forms</a>
%Y A000049 Sequence in context: A022857 A000691 A103285 this_sequence A000050 A050253 
               A107250
%Y A000049 Adjacent sequences: A000046 A000047 A000048 this_sequence A000050 A000051 
               A000052
%K A000049 nonn
%O A000049 0,3
%A A000049 N. J. A. Sloane (njas(AT)research.att.com).

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