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a(n)=number of Gaussian integers z=a+bi satisfying n - 1/2 < |z| <= n + 1/2, a>0, b>=0.
1

%I #8 Mar 30 2012 18:56:27

%S 0,2,3,4,8,7,10,10,12,17,14,18,17,22,22,21,28,28,28,29,28,36,35,36,36,

%T 42,41,40,46,43,50,48,47,52,56,56,57,56,62,59,66,62,66,69,66,72,69,76,

%U 76,78,79,80,86,79,84,88,85,94,84,98,95

%N a(n)=number of Gaussian integers z=a+bi satisfying n - 1/2 < |z| <= n + 1/2, a>0, b>=0.

%H <a href="/index/Ga#gaussians">Index entries for Gaussian integers and primes</a>

%Y a(n)=(1/4)*s(n) for n >= 1, where s=A036705.

%K nonn

%O 0,2

%A _Clark Kimberling_