20070605, 20:37  #1 
20243_{8} Posts 
Mersenne exponents
Hello:
I have a query regarding the mersenne primes that I hope it is not trivial and don't have been responded many times: There are 3 Known Mersenne primes that are also exponents of Mersenne primes: 7,31 and 127.  Does exist some conjecture, theorem, hypothesis that says the other Mersenne primes are not or could not be Mersenne primes exponents ? Does it exist some investigation or project on this matter? Thank you. Xordan ( Software translation ) 
20070606, 00:58  #2  
"Richard B. Woods"
Aug 2002
Wisconsin USA
1E0C_{16} Posts 
Quote:
It is not trivial but many other people have previously thought of it and asked it. Quote:
To find more information on this subject, search on "double Mersenne prime" or "double Mersenne number". Quote:
Last fiddled with by cheesehead on 20070606 at 01:01 

20070606, 02:25  #3  
Account Deleted
"Tim Sorbera"
Aug 2006
San Antonio, TX USA
17×251 Posts 
Quote:


20070607, 13:40  #4 
Feb 2007
2^{4}·3^{3} Posts 

20070607, 16:05  #5 
Bronze Medalist
Jan 2004
Mumbai,India
2^{2}·3^{3}·19 Posts 

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