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A152306 Simple 'chaotic' sequence: a(n)=floor(log(2)*((1 + sqrt(3))/2)^n) mod 10. 0
0, 0, 1, 1, 2, 3, 4, 6, 8, 1, 5, 1, 9, 9, 4, 4, 1, 9, 0, 9, 4, 4, 2, 4, 5, 7, 5, 9, 2, 6, 7, 5, 9, 2, 2, 4, 0, 2, 2, 8, 5, 4, 7, 9, 8, 3, 8, 4, 9, 1, 6, 1, 4, 5, 3, 0, 7, 2, 6, 3, 6, 8, 1, 5, 1, 3, 9, 6, 0, 9, 9, 8, 3, 8, 5, 9, 1, 1, 7, 7, 1, 5, 5, 8, 6, 5, 3, 6, 8, 1, 0, 0, 6, 6, 9, 8, 2, 2, 8, 9, 8 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

COMMENTS

Derived from the Mathematica generated binet:

f[n_Integer] = Module[{a}, a[n] /. RSolve[{a[n] == a[n - 2] + a[n - 3] + a[n - 1]/10,a[0] == 1, a[1] == 1, a[2] == 1}, a[n], n][[1]] // FullSimplify] ;

by plotting the 3 parts in 3D and recognizing that the real part was the major

contributor to the sequence and using the nearest constants in that part.

LINKS

Table of n, a(n) for n=0..100.

FORMULA

a(n)=floor(log(2)*((1 + sqrt(3))/2)^n) mod 10

MATHEMATICA

Clear[f]; f[n_] = Log[2]*((1 + Sqrt[3])/2)^n;

Table[Mod[Floor[f[n]], 10], {n, 0, 100}]

CROSSREFS

Sequence in context: A171249 A036413 A069912 * A120817 A327887 A339361

Adjacent sequences:  A152303 A152304 A152305 * A152307 A152308 A152309

KEYWORD

nonn,less

AUTHOR

Roger L. Bagula, Dec 02 2008

STATUS

approved

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Last modified December 7 22:50 EST 2021. Contains 349590 sequences. (Running on oeis4.)