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Number of positive integers <= 2^n of form 5 x^2 + 9 y^2.
0

%I #11 Jan 24 2022 03:56:02

%S 0,0,0,1,3,5,10,18,32,60,110,207,391,739,1411,2695,5158,9941,19187,

%T 37151,72038,140000,272470,531133,1036727,2025812,3962913,7759632,

%U 15207510,29828260,58549403,115004444,226040861,444547031,874762315

%N Number of positive integers <= 2^n of form 5 x^2 + 9 y^2.

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

%Y Cf. A020688.

%K nonn

%O 0,5

%A _David W. Wilson_