%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