3,1

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Hall, James S. A remark on the primeness of Mersenne numbers. J. London Math. Soc. 28, (1953). 285-287.

Sequence in context: A100931 A152180 A042135 this_sequence A037122 A118840 A111816

Adjacent sequences: A003006 A003007 A003008 this_sequence A003010 A003011 A003012

nonn,easy

N. J. A. Sloane (njas(AT)research.att.com).