Search: id:A153643
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%I A153643
%S A153643 2,3,3,5,7,13,23,45,87,173,343,685,1367,2733,5463,10925,21847,43693,87383,
%T A153643 174765,349527,699053,1398103,2796205,5592407,11184813,22369623,44739245,
%U A153643 89478487,178956973,357913943,715827885,1431655767,2863311533,5726623063
%N A153643 Jacobsthal numbers A001045 incremented by 2.
%F A153643 a(n) = 2+A001045(n) = A001045(n)+A007395(n) = 1+A128209(n).
%F A153643 a(n)-A010684(n) = A078008(n), first differences of A001045. [From Paul 
               Curtz (bpcrtz(AT)free.fr), Jan 17 2009]
%F A153643 G.f.: (2-x-5x^2)/((1+x)(1-x)(1-2x)). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), 
               Jan 23 2009]
%Y A153643 Sequence in context: A017984 A035066 A035068 this_sequence A053218 A154690 
               A046937
%Y A153643 Adjacent sequences: A153640 A153641 A153642 this_sequence A153644 A153645 
               A153646
%K A153643 nonn,easy
%O A153643 0,1
%A A153643 Paul Curtz (bpcrtz(AT)free.fr), Dec 30 2008
%E A153643 Edited and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 
               23 2009

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