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

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Intern
Joined: 11 Jun 2007
Posts: 18

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

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

any shortcut available? i dono how to solve

Kudos [?]: [0], given: 0

Director
Joined: 13 Mar 2007
Posts: 542

Kudos [?]: 89 [0], given: 0

Schools: MIT Sloan

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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 .

Kudos [?]: 89 [0], given: 0

Senior Manager
Joined: 06 Jul 2004
Posts: 468

Kudos [?]: 132 [0], given: 0

Location: united states

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24 Jun 2007, 12:19
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..

Kudos [?]: 132 [0], given: 0

24 Jun 2007, 12:19
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