%I A066845
%S A066845 3,5,3,17,11,13,43,257,57,205,683,241,2731,3277,331,65537,43691,4033,
%T A066845 174763,61681,5419,838861,2796203,65281,1016801,13421773,261633,
%U A066845 15790321,178956971,80581,715827883,4294967297,1397419,3435973837
%N A066845 LCM{2^k + 1, k=0..n}/lcm{2^k + 1, k=0..n-1}.
%C A066845 The primitive part of 2^n+1. Bisection of A019320. - T. D. Noe, Jul 24 
               2008
%H A066845 T. D. Noe, <a href="b066845.txt">Table of n, a(n) for n=1..1000</a>
%F A066845 a(n) = cyclotomic(2*n, 2). - Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 
               05 2004
%Y A066845 Cf. A051844, A034268, A019320.
%Y A066845 Cf. A019320.
%Y A066845 Sequence in context: A023587 A002586 A002587 this_sequence A014782 A094466 
               A134771
%Y A066845 Adjacent sequences: A066842 A066843 A066844 this_sequence A066846 A066847 
               A066848
%K A066845 easy,nonn
%O A066845 1,1
%A A066845 Vladeta Jovovic (vladeta(AT)eunet.rs), Jan 20 2002