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grc
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Python 2, 98

i=input();d=o=9 while~-d: n=i;d=o+1;o=i=0 while(n*d+i)**.5%1:i=-~i%d;d+=9*d*0**i print'%d'%n**.5 

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grc
  • 19.1k
  • 9
  • 38
  • 80