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Number of positive integers <= 2^n of form 6 x^2 + 7 y^2.
0

%I #11 Jan 24 2022 04:25:03

%S 0,0,0,2,3,6,11,20,36,69,126,237,446,841,1595,3046,5840,11238,21684,

%T 41955,81333,158007,307378,598968,1168767,2283307,4465653,8742429,

%U 17130723,33594988,65933365,129491817,254484590,500430065,984625784

%N Number of positive integers <= 2^n of form 6 x^2 + 7 y^2.

%H <a href="/index/Qua#quadpop">Index entries for sequences related to populations of quadratic forms</a>

%Y Cf. A020689.

%K nonn

%O 0,4

%A _David W. Wilson_