>>>Here is a bit more which explains the reason you might be having trouble.
>>>
>>>Which natural numbers occur as the area of a right triangle with three rational sides? This is a very old question and is still unsolved, although partial answers are known (for example, five is the smallest such natural number). This is an unsolved math problem and recent progress has come about through its connections with other important open questions in number theory.
>>>
>>>Notice that math professor Dragan has NOT jumped into this one. ;-)
>>
>>Are you talking about http://www.maa.org/dist-lecture/ ?
>>
>>It seems to be the focus of cutting-edge research by professional mathematicians. Are you just yanking our chains, or what?
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>
>What's wrong with a challenging puzzle?

It's not merely a challenging puzzle, it's an unproven mathematical conjecture.