Search: id:A006266
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%I A006266 M2073
%S A006266 2,14,2786,21624372014,10111847525912679844192131854786
%N A006266 A continued cotangent.
%D A006266 Shallit, Jeffrey; Predictable regular continued cotangent expansions. 
               J. Res. Nat. Bur. Standards Sect. B 80B (1976), no. 2, 285-290.
%D A006266 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%F A006266 Contribution from Artur Jasinski (grafix(AT)csl.pl), Sep 24 2008: (Start)
%F A006266 1) Recurrence: a(n+1)=a(n)^3 + 3*a(n) a(0)=2
%F A006266 2) Round[(1+Sqrt[2])^(3^n)] (End)
%t A006266 Contribution from Artur Jasinski (grafix(AT)csl.pl), Sep 24 2008: (Start)
%t A006266 a = {}; k = 2; Do[AppendTo[a, k]; k = k^3 + 3 k, {n, 1, 10}]; a
%t A006266 or Table[Round[(1+Sqrt[2])^(3^n],{n,0,10}] (*Artur Jasinski*) (End)
%Y A006266 A006267 [From Artur Jasinski (grafix(AT)csl.pl), Sep 24 2008]
%Y A006266 Sequence in context: A032419 A130421 A156736 this_sequence A106484 A027739 
               A104773
%Y A006266 Adjacent sequences: A006263 A006264 A006265 this_sequence A006267 A006268 
               A006269
%K A006266 nonn
%O A006266 1,1
%A A006266 N. J. A. Sloane (njas(AT)research.att.com).

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