Gaussian Prime by twobit (hallvabo)

r=range(-23,24)
for y in r:
 s=""
 for x in r:p=x*x+y*y or 1;s+=" [ ]"[p**.5%16in[7,3,11]or~-2**p%p==1::2]
 print s

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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