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

%I #7 Mar 30 2012 18:56:26

%S 1,2,3,5,6,9,9,10,13,15,17,16,17,23,22,25,23,27,28,31,33,30,37,35,36,

%T 43,41,43,42,45,49,46,53,51,55,58,51,61,56,67,63,60,67,67,73,72,67,75,

%U 74,79,81,83,82,79,85,84,93,87,93,90,95

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

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

%K nonn

%O 0,2

%A _Clark Kimberling_