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A165734 Period 2: repeat 6,30. 7
6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Continued fraction expansion of (15+sqrt(230))/5. [From Klaus Brockhaus, Apr 28 2010]

LINKS

Table of n, a(n) for n=1..56.

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

FORMULA

G.f.: 6x(1+5x)/((1-x)(1+x)). a(n)=6*A010686(n-1). [From Philippe Deléham, Sep 27 2009]

a(n)=18+12(-1)^n, with n>=1 [From Paolo P. Lava, Sep 28 2009]

PROG

(PARI) a(n)=30-n%2*24 \\ Charles R Greathouse IV, Jun 02 2011

CROSSREFS

Cf. A124886, A002445, A040214.

Sequence in context: A122802 A144746 A051685 * A260017 A123624 A066197

Adjacent sequences:  A165731 A165732 A165733 * A165735 A165736 A165737

KEYWORD

nonn,easy

AUTHOR

Paul Curtz, Sep 25 2009

EXTENSIONS

Edited by N. J. A. Sloane, Sep 25 2009

STATUS

approved

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Last modified December 7 11:48 EST 2016. Contains 278874 sequences.