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Quick note - the problem with Youtube videos not embedding on the forum appears to have been fixed, thanks to ZiprHead. If you do still see problems let me know.
Does anyone here know Fermat's proof that any prime number that equals 4n +1 (where n is an integer) is equal to one and only one group of two perfect squares? For example 29 is equal to 4(7) + 1 and 5^2 + 2^2.
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