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設此數為n,且n+168=a2,n+100=b2,則a2-b2=68=22×17,即(a+b)(a-b)=22×17.但a+b與a-b的奇偶性相同,故a+b=34,a-b=2,於是a=18,b=16,從而n=156.故答案為156.
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