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A276866 First differences of the Beatty sequence A004976 for 2 + sqrt(5). 3

%I #11 Jan 30 2017 02:49:38

%S 4,4,4,4,5,4,4,4,5,4,4,4,5,4,4,4,5,4,4,4,4,5,4,4,4,5,4,4,4,5,4,4,4,5,

%T 4,4,4,4,5,4,4,4,5,4,4,4,5,4,4,4,5,4,4,4,4,5,4,4,4,5,4,4,4,5,4,4,4,5,

%U 4,4,4,4,5,4,4,4,5,4,4,4,5,4,4,4,5,4

%N First differences of the Beatty sequence A004976 for 2 + sqrt(5).

%C (a(n+1)) is the unique fixed point of the substitution 4 -> 4445, 5 -> 44454, since alpha = sqrt(5)-2 satisfies 1/(4+alpha) = alpha. See Allouche and Shallit on characteristic words. - _Michel Dekking_, Jan 30 2017

%D J.-P. Allouche and J. Shallit, Automatic Sequences, Cambridge Univ. Press, 2003, p. 285.

%H Clark Kimberling, <a href="/A276866/b276866.txt">Table of n, a(n) for n = 1..10000</a>

%F a(n) = floor(n*r) - floor(n*r - r), where r = 2 + sqrt(5), n >= 1.

%t z = 500; r = 2+Sqrt[5]; b = Table[Floor[k*r], {k, 0, z}]; (* A004976 *)

%t Differences[b] (* A276866 *)

%Y Cf. A004976, A276884.

%K nonn,easy

%O 1,1

%A _Clark Kimberling_, Sep 24 2016

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Last modified April 24 20:08 EDT 2024. Contains 371963 sequences. (Running on oeis4.)