%I A046070
%S A046070 3,1,4,5,3,26,7,2,4,3,2,6,9,2,16,5,3,6,2553,24,10,31,2,14,5,9,6,3,2,
%T A046070 16,5,3,6,9,4,14,11,3,4,3,5,4,11,2,8,3,4,6,9,4,18,7,3,12,149,3,14,3,2,
%U A046070 16,3,3,4,113,3,14,11,9,18,5,2,4,13,2,16,221,4,8,5,4,6,31,3,6,5,3,4,3
%N A046070 Second smallest m such that (2n-1)2^m-1 is prime, or -1 if no such value 
               exists.
%C A046070 There exist odd integers 2k-1 such that (2k-1)2^n-1 is always composite.
%D A046070 Ribenboim, P. The New Book of Prime Number Records. New York: Springer-Verlag, 
               pp. 357-359, 1996.
%H A046070 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               RieselNumber.html">Link to a section of The World of Mathematics.</
               a>
%Y A046070 Cf. A046068, A046069.
%Y A046070 Sequence in context: A097207 A118469 A069203 this_sequence A068399 A105177 
               A050057
%Y A046070 Adjacent sequences: A046067 A046068 A046069 this_sequence A046071 A046072 
               A046073
%K A046070 nonn
%O A046070 1,1
%A A046070 Eric Weisstein (eric(AT)weisstein.com)