Thread: 3, 7, 31, 127
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Old 2019-04-03, 12:14   #4
Batalov
 
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Mar 2008
Phi(4,2^7658614+1)/2

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Quote:
Originally Posted by petrw1 View Post
What do these have in common?

This list may very well be complete.
Exponents of double Mersenne primes ( = Mersenne primes p such that 2^p - 1 is also a Mersenne prime).

Mersenne numbers that are also lucky numbers.
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