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January 13th, 2010, 08:25 AM   #1
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natural numbers !

Find all such that
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January 13th, 2010, 08:41 AM   #2
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Re: natural numbers !

Factorials are positive, so if t > 2 then
t! > m! + n! for m,n < t
t! < m! + n! for m >= t or n >= t

So all you need to do is check t <= 2.
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