I donot know whether it will stop


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送交者: xinku 于 2008-01-07, 12:02:30:

回答: the only known numbers, called perfect numer, are 6,28,496 and 8128. 由 steven 于 2008-01-07, 11:42:23:

but whether it stops or not is a fact, independent of whether I know the fact.



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