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A040604 Continued fraction for sqrt(630). 1
25, 10, 50, 10, 50, 10, 50, 10, 50, 10, 50, 10, 50, 10, 50, 10, 50, 10, 50, 10, 50, 10, 50, 10, 50, 10, 50, 10, 50, 10, 50, 10, 50, 10, 50, 10, 50, 10, 50, 10, 50, 10, 50, 10, 50, 10, 50, 10, 50, 10, 50, 10, 50, 10, 50, 10, 50, 10, 50, 10, 50, 10, 50 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..62.

Index entries for continued fractions for constants

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

FORMULA

a(n) = 30+20*(-1)^n-25*[C(2*n,n) mod 2]. - Paolo P. Lava, May 15 2009

G.f.: 5*(5 + 2*x + 5*x^2)/(1 - x^2). - Stefano Spezia, Dec 22 2021

a(n) = 5 * A040024(n). - Alois P. Heinz, Dec 22 2021

MAPLE

with(numtheory): Digits := 300: convert(evalf(sqrt(630)), confrac);

MATHEMATICA

Block[{$MaxExtraPrecision=1000}, ContinuedFraction[Sqrt[630], 100]] (* or *) PadRight[{25}, 100, {50, 10}] (* Harvey P. Dale, May 20 2018 *)

CROSSREFS

Cf. A040024.

Sequence in context: A181763 A171638 A217432 * A097440 A040603 A033345

Adjacent sequences:  A040601 A040602 A040603 * A040605 A040606 A040607

KEYWORD

nonn,cofr,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified January 20 08:32 EST 2022. Contains 350467 sequences. (Running on oeis4.)