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Number of positive integers <= 2^n of form 4 x^2 + 5 y^2.
0

%I #11 Jan 24 2022 03:56:21

%S 0,0,1,2,4,7,14,25,45,84,154,290,549,1043,1990,3820,7352,14198,27473,

%T 53327,103697,201926,393781,769123,1503776,2943595,5767727,11310982,

%U 22200249,43604981,85706123,168562900,331717805,653148282,1286697640

%N Number of positive integers <= 2^n of form 4 x^2 + 5 y^2.

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

%Y Cf. A020682.

%K nonn

%O 0,4

%A _David W. Wilson_