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A144837 a(n) = round(c^(5^n)) where c = phi = 1.6180339887498948482... = (sqrt(5)+1)/2. 4
11, 167761, 132878596168524201724674011, 41426205597206759619277357446339665409241444631440862438195414952717638786238921273966406265203029690673182412697744528122767017761 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..4.

FORMULA

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]

MATHEMATICA

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

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

CROSSREFS

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

Sequence in context: A013794 A022009 A201249 * A324267 A085017 A239203

Adjacent sequences:  A144834 A144835 A144836 * A144838 A144839 A144840

KEYWORD

nonn

AUTHOR

Artur Jasinski, Sep 22 2008

STATUS

approved

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Last modified February 27 07:52 EST 2020. Contains 332300 sequences. (Running on oeis4.)