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January 24, 2018 16:37
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Ulam Spiral in Python 3 in less than 280 characters. Small enough to tweet!
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| import tkinter as t | |
| d=500 | |
| w=t.Canvas(t.Tk(),width=d,height=d) | |
| w.pack() | |
| x=d/2;y=x;v=1;z=0;c=2;r=1;p=[] | |
| for i in range(2,d*200): | |
| x+=v;y+=z | |
| if r*2==c:z=v;v=0 | |
| if r==c:v=-z;z=0;c+=2;r=0 | |
| r+=1;t=1 | |
| for s in p: | |
| if i%s==0:t=0;break | |
| if t==1:p+=[i];w.create_arc(x,y,x,y) | |
| w.mainloop() |
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