MATLAB Mini Hack

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Recamán's sequence (illustrated with spiraling squares)

Eugen Prel on 28 Oct 2021
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n=500;
s=zeros(1,3*n);
z=-1;
c=bone(n);
figure('Color',[.16 .16 .2]);
hold; axis off equal;
Current plot held
for i=1:n-1
t=s(i)-i;
for j=1:i+1
if s(j)==t||t<0
t=s(i)+i;
break;
end
end
s(i+1)=t;
y=z^i*abs(s(i+1)-s(i))/2;
line(s(i)*[1,1],[0,y],'Col',c(i,:));
line([s(i),t],[y,y],'Col',c(i,:));
line([t,t],[y,0],'Col',c(i,:));
end
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