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李學數說數學故事 /
李信明 /
九章出版社
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Mathematical Magic Show / Martin Gardner
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mathworld.wolfram.com/MersenneNumber.html
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www.math.swt.edu/~haz/prob_sets/notes/node13.html
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http://mathworld.wolfram.com/OddPerfectNumber.html
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public.logica.com/~stepneys/cyc/p/perfect.htm
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mathworld.wolfram.com/AmicablePair.html
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mathworld.wolfram.com/AbundantNumber.html
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mathworld.wolfram.com/DeficientNumber.html