%I #3 Mar 30 2012 16:50:05
%S 3,7,17,31,89,127,607,2203,3217,4423,9941,19937,23209,86243,132049,
%T 756839,1257787,2976221,6972593
%N Bisection of A000043.
%K nonn
%O 0,1
%A _N. J. A. Sloane_, Nov 19 2004
