OFFSET
1,1
COMMENTS
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]
EXAMPLE
127 = 2^7 - 1 is a Mersenne prime and its "look and say" description, 111217, is also prime, so 127 belongs to the sequence.
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Joseph L. Pe, Jan 30 2003
STATUS
approved