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A144839 a(n) = round(phi^(7^n)) where phi = 1.6180339887498948482... = (sqrt(5)+1)/2. 4
29, 17393796001, 481682208844384447843365760878364816732549453120338354329505085763436029 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..3.

FORMULA

a(n)=G^(7^n)+(1-G)^(7^n) = G^(7^n)+(-G)^(-7^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^(7^n)], {n, 1, 5}] (*Artur Jasinski*)

c = (1 + Sqrt[5])/2; Table[Expand[c^(7^n) + (1 - c)^(7^n)], {n, 0, 5}] [From Artur Jasinski, Oct 05 2008]

CROSSREFS

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

Sequence in context: A087528 A307622 A219015 * A124992 A296522 A023926

Adjacent sequences:  A144836 A144837 A144838 * A144840 A144841 A144842

KEYWORD

nonn,bref

AUTHOR

Artur Jasinski, Sep 22 2008

STATUS

approved

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Last modified March 29 05:39 EDT 2020. Contains 333105 sequences. (Running on oeis4.)