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Old 2016-01-24, 00:30   #1
paulunderwood
 
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Default Question about Mersenne divisors

2^11-1 = 23*89 and 2^89-1 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 2016-01-24 at 00:42
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Old 2016-01-24, 01:41   #2
Batalov
 
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Phi(4,2^7658614+1)/2

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23209 | 2^967-1
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