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Old 2019-04-11, 01:14   #3
wblipp
 
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"William"
May 2003
New Haven

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Quote:
Originally Posted by enzocreti View Post
let be p an arbitrary prime...
can you find values of p such that


(10^p-1)/9+1 has the form s*2^k?
2, 3, 7, 229, 1579
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