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A144837 a(n) = round(c^(5^n)) where c = phi = 1.6180339887498948482... = (sqrt(5)+1)/2. 4

%I

%S 11,167761,132878596168524201724674011,

%T 41426205597206759619277357446339665409241444631440862438195414952717638786238921273966406265203029690673182412697744528122767017761

%N a(n) = round(c^(5^n)) where c = phi = 1.6180339887498948482... = (sqrt(5)+1)/2.

%F a(n)=G^(5^n)+(1-G)^(5^n) = G^(5^n)+(-G)^(-5^n) where G is Golden ratio = (1+Sqrt[5])/2 = 1.618033989 [From _Artur Jasinski_, Oct 05 2008]

%t c = N[GoldenRatio, 1000]; Table[Round[c^(5^n)], {n, 1, 5}] (*Artur Jasinski*)

%t c = (1 + Sqrt[5])/2; Table[Expand[c^(5^n) + (1 - c)^(5^n)], {n, 0, 5}] [From _Artur Jasinski_, Oct 05 2008]

%Y Cf. A001566, A006267, A144836, A144837, A144838, A144839.

%K nonn

%O 1,1

%A _Artur Jasinski_, Sep 22 2008

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Last modified March 30 12:10 EDT 2020. Contains 333125 sequences. (Running on oeis4.)