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on 4 Oct 2021
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nOffset = [0 1e6 1e12];
for i=1:3
nX = 90;
nY = 135;
A = nOffset(i) + (1:nX*nY);
A = reshape(A, [nX nY])';
sieveA = isprime(A);
set(gcf,'Color', 'w')
subplot(1,3,i);
imagesc(sieveA); colormap('gray')
axis image; set(gca, 'XTick', [], 'YTick', [])
end
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