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A106253 First difference of A106252. 1
2, 2, 2, 1, 3, 1, 2, 2, 2, 1, 3, 1, 2, 2, 2, 1, 3, 1, 2, 2, 2, 1, 3, 1, 2, 2, 2, 1, 3, 1, 2, 2, 2, 1, 3, 1, 2, 2, 2, 1, 3, 1, 2, 2, 2, 1, 3, 1, 2, 2, 2, 1, 3, 1, 2, 2, 2, 1, 3, 1, 2, 2, 2, 1, 3, 1, 2, 2, 2, 1, 3, 1, 2, 2, 2, 1, 3, 1, 2, 2, 2, 1, 3, 1, 2, 2, 2, 1, 3, 1, 2, 2, 2, 1, 3, 1, 2, 2, 2, 1, 3, 1, 2, 2, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

It appears that this sequence is periodic with period 6.

Terms of the simple continued fraction of 21/[2*sqrt(78)-9]. Decimal expansion of 2441/10989. [From Paolo P. Lava, Aug 05 2009]

LINKS

Table of n, a(n) for n=1..105.

Index entries for linear recurrences with constant coefficients, signature (-1, 0, 1, 1).

FORMULA

a(n)=1/90*{-4*(n mod 6)+41*[(n+1) mod 6]-19*[(n+2) mod 6]+26*[(n+3) mod 6]+11*[(n+4) mod 6]+11*[(n+5) mod 6]} - Paolo P. Lava, Nov 21 2006

a(n)=1/90*{-4*(n mod 6)+41*[(n+1) mod 6]-19*[(n+2) mod 6]+26*[(n+3) mod 6]+11*[(n+4) mod 6]+11*[(n+5) mod 6]} with n>=0 - Paolo P. Lava, Nov 27 2006

MATHEMATICA

LinearRecurrence[{-1, 0, 1, 1}, {2, 2, 2, 1}, 105] (* Ray Chandler, Aug 26 2015 *)

CROSSREFS

Cf. A106252.

Cf. A083039. [From R. J. Mathar, Aug 24 2008]

Sequence in context: A265671 A214707 A083039 * A078720 A270488 A083898

Adjacent sequences:  A106250 A106251 A106252 * A106254 A106255 A106256

KEYWORD

nonn

AUTHOR

John W. Layman, Apr 27 2005

STATUS

approved

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Last modified February 24 05:37 EST 2018. Contains 299597 sequences. (Running on oeis4.)