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A040384 Continued fraction for sqrt(405). 2
20, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40, 8, 40 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..74.

Index entries for continued fractions for constants

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

FORMULA

a(n)=24+16*(-1)^n-20*[C(2*n,n) mod 2], with n>=0 [From Paolo P. Lava, Apr 29 2009]

MAPLE

with(numtheory): Digits := 300: convert(evalf(sqrt(405)), confrac);

MATHEMATICA

Block[{$MaxExtraPrecision=1000}, ContinuedFraction[Sqrt[405], 120]] (* or *) PadRight[{20}, 120, {40, 8}] (* Harvey P. Dale, Dec 02 2018 *)

CROSSREFS

Sequence in context: A108967 A097390 A123174 * A078080 A216289 A136010

Adjacent sequences:  A040381 A040382 A040383 * A040385 A040386 A040387

KEYWORD

nonn,cofr,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified October 23 12:19 EDT 2019. Contains 328345 sequences. (Running on oeis4.)