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OpenStudy (anonymous):
prove 2^66-1 is not prime
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ganeshie8 (ganeshie8):
\[2^{66}-1 = 4^{33}-1 = (4-1)(4^{32}+4^{31}+\cdots +1)\]
OpenStudy (anonymous):
i dint even note ! wow !
ganeshie8 (ganeshie8):
we have this nice relation : \(2^a-1\) is a prime \(\iff\) \(a\) is a prime
ganeshie8 (ganeshie8):
look up mersenne primes for more cool stuff..
OpenStudy (anonymous):
seems like
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