20160124, 00:30  #1 
Sep 2002
Database er0rr
2^{7}·31 Posts 
Question about Mersenne divisors
2^111 = 23*89 and 2^891 is prime. Are there any other examples where a Mersenne prime's exponent being a proper divisor of an Mp?
Last fiddled with by paulunderwood on 20160124 at 00:42 
20160124, 01:41  #2 
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2
25D1_{16} Posts 
23209  2^9671

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