11^2=121,so,121*x^2=aabb,x^2=81 is not good ,64 is OK.
121*64=7744.
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good for a few guesses; but not for a lot guesses.
-皆兄弟也-
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06/17/2010 postreply
01:14:11
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Yes,we can cancel 81,49,36,25,16 by number theory.
-jinjing-
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06/17/2010 postreply
16:13:58