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is 2^67-1 a prime number? any shortcut available? i dono

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is 2^67-1 a prime number? any shortcut available? i dono [#permalink]

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New post 24 Jun 2007, 03:44
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is 2^67-1 a prime number?

any shortcut available? i dono how to solve
Director
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New post 24 Jun 2007, 09:19
umm nice problem ..

All i can gather is the units digit should be 7 ..

dont know how to proceed beyond .
Senior Manager
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New post 24 Jun 2007, 12:19
grad_mba wrote:
umm nice problem ..

All i can gather is the units digit should be 7 ..

dont know how to proceed beyond .


Yes, I'm stuck too.. what is the source of this problem?
_________________

for every person who doesn't try because he is
afraid of loosing , there is another person who
keeps making mistakes and succeeds..

  [#permalink] 24 Jun 2007, 12:19
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is 2^67-1 a prime number? any shortcut available? i dono

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