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%I #13 Sep 01 2022 18:56:30
%S 0,3,5,8,9,17,16,17,19,25,35,27,26,37,39,49,41,46,47,53,62,51,66,63,
%T 57,76,77,85,75,77,87,79,93,92,100,112,93,106,97,122,125,107,115,115,
%U 131,138,123,130,126,134,147,164,163,149,151,148,171,159,172,160,172,180,176
%N a(n) is the number of grid points in a square lattice strictly outside of the area enclosed by n loops of an Archimedean spiral and inside (or on the boundary) of a circle with radius n.
%H Karl-Heinz Hofmann, <a href="/A355761/a355761.pdf">Examples of a(1..8)</a>
%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Archimedean_spiral">Archimedean spiral</a>
%F a(n) = A000328(n) - A355760(n).
%e See the PDF in links.
%Y Cf. A000328, A355760.
%K nonn
%O 0,2
%A _Karl-Heinz Hofmann_, Jul 29 2022
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