%I A003260 M2693
%S A003260 3,7,31,127,89,8191,131071,524287,178481,2089,2147483647,
%T A003260 616318177,164511353,2099863,13264529,20394401,3203431780337,
%U A003260 2305843009213693951
%N A003260 Largest factor of Mersenne numbers.
%D A003260 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A003260 J. Brillhart et al., Factorizations of b^n +- 1. Contemporary Mathematics, 
               Vol. 22, Amer. Math. Soc., Providence, RI, 2nd edition, 1985; and 
               later supplements.
%H A003260 T. D. Noe, <a href="b003260.txt">Table of n, a(n) for n=1..95</a> (derived 
               from Brillhart et al.)
%H A003260 J. Brillhart et al., <a href="http://www.ams.org/online_bks/conm22/">
               Factorizations of b^n +- 1</a>, Contemporary Mathematics, Vol. 22, 
               Amer. Math. Soc., Providence, RI, 3rd edition, 2002.
%H A003260 C. K. Caldwell, <a href="http://www.utm.edu/research/primes/mersenne/
               index.html">Mersenne primes</a>
%H A003260 S. S. Wagstaff, Jr., <a href="http://www.cerias.purdue.edu/homes/ssw/
               cun/index.html">The Cunningham Project</a>
%Y A003260 Cf. A001348.
%Y A003260 Cf. A016047, A046800
%Y A003260 Sequence in context: A103901 A089162 A016047 this_sequence A152058 A138865 
               A051281
%Y A003260 Adjacent sequences: A003257 A003258 A003259 this_sequence A003261 A003262 
               A003263
%K A003260 nonn,nice
%O A003260 1,1
%A A003260 N. J. A. Sloane (njas(AT)research.att.com).