is 2^67-1 a prime number? any shortcut available? i dono : PS Archive
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 19 Jan 2017, 10:21

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

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

 post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
Intern
Joined: 11 Jun 2007
Posts: 18
Followers: 0

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

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

### Show Tags

24 Jun 2007, 02:44
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

### HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

is 2^67-1 a prime number?

any shortcut available? i dono how to solve
Director
Joined: 13 Mar 2007
Posts: 545
Schools: MIT Sloan
Followers: 4

Kudos [?]: 70 [0], given: 0

### Show Tags

24 Jun 2007, 08:19
umm nice problem ..

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

dont know how to proceed beyond .
Senior Manager
Joined: 06 Jul 2004
Posts: 473
Location: united states
Followers: 1

Kudos [?]: 105 [0], given: 0

### Show Tags

24 Jun 2007, 11:19
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..

24 Jun 2007, 11:19
Display posts from previous: Sort by

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

 post reply Question banks Downloads My Bookmarks Reviews Important topics

 Powered by phpBB © phpBB Group and phpBB SEO Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.