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A bisection of A002439.
1

%I #2 Mar 30 2012 16:51:15

%S 23,257543,27138236663,11828536957233383,14639678925928297567703,

%T 41393949926819051111431239623,231969423543894989257690172433129143,

%U 2330640193014931063017585202490874608196263,38966520031501064708241399303059964064529134680983,1023409776429490887726960719866571404072100379273323303303

%N A bisection of A002439.

%K nonn

%O 0,1

%A _N. J. A. Sloane_, Nov 07 2009