Number Theory | Fermat's Numbers/ Primes

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This video is about Number Theory | Fermat's Numbers/ Primes.
details of example at 6:48 can be found at Link :
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3^5 = 243 = 257 -14 so 3^5 = (-14) (mod 257 ), the correct symbol is 3 parallel lines - congruence - instead of '=' equality

dimitriosspanos
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I died right after seeing (3^5)^25 = (-14)^25
I would be thankful if someone explained. Thanks

ahnafdaniel