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A040622 Continued fraction for sqrt(648). 1
25, 2, 5, 6, 5, 2, 50, 2, 5, 6, 5, 2, 50, 2, 5, 6, 5, 2, 50, 2, 5, 6, 5, 2, 50, 2, 5, 6, 5, 2, 50, 2, 5, 6, 5, 2, 50, 2, 5, 6, 5, 2, 50, 2, 5, 6, 5, 2, 50, 2, 5, 6, 5, 2, 50, 2, 5, 6, 5, 2, 50, 2, 5, 6, 5, 2, 50, 2, 5, 6, 5, 2, 50, 2, 5, 6, 5, 2, 50, 2, 5, 6, 5, 2, 50, 2, 5 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..86.

Index entries for continued fractions for constants

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

FORMULA

a(n)=(1/18)*{-130*(n mod 6)+23*[(n+1) mod 6]+17*[(n+2) mod 6]+11*[(n+3) mod 6]+5*[(n+4) mod 6]+158*[(n+5) mod 6]}-25*[C(2*n,n) mod 2], with n>=0 [From Paolo P. Lava, May 15 2009]

MAPLE

with(numtheory): Digits := 300: convert(evalf(sqrt(648)), confrac);

MATHEMATICA

ContinuedFraction[Sqrt[648], 90] (* or *) PadRight[{25}, 90, {50, 2, 5, 6, 5, 2}] (* Harvey P. Dale, Aug 10 2012 *)

CROSSREFS

Sequence in context: A040620 A040621 A006852 * A040623 A317470 A094582

Adjacent sequences:  A040619 A040620 A040621 * A040623 A040624 A040625

KEYWORD

nonn,cofr,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified May 18 23:31 EDT 2022. Contains 353826 sequences. (Running on oeis4.)