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Mersenne primes with prime "look and say" descriptions.
0

%I #4 Feb 11 2014 19:05:41

%S 3,7,127,8191

%N Mersenne primes with prime "look and say" descriptions.

%C None of the 6th through the 30th Mersenne primes are in this sequence, so the next term in the sequence (if it exists) has at least 60050 digits. [From _Nathaniel Johnston_, Nov 02 2010]

%e 127 = 2^7 - 1 is a Mersenne prime and its "look and say" description, 111217, is also prime, so 127 belongs to the sequence.

%Y Cf. A005150.

%K base,nonn

%O 1,1

%A _Joseph L. Pe_, Jan 30 2003