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A040958 Continued fraction for sqrt(990). 1
31, 2, 6, 2, 62, 2, 6, 2, 62, 2, 6, 2, 62, 2, 6, 2, 62, 2, 6, 2, 62, 2, 6, 2, 62, 2, 6, 2, 62, 2, 6, 2, 62, 2, 6, 2, 62, 2, 6, 2, 62, 2, 6, 2, 62, 2, 6, 2, 62, 2, 6, 2, 62, 2, 6, 2, 62, 2, 6, 2, 62, 2, 6, 2, 62, 2, 6, 2, 62, 2, 6, 2, 62, 2, 6, 2, 62, 2, 6, 2, 62, 2, 6, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..83.

Index entries for continued fractions for constants

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

FORMULA

a(n)=-12*(n mod 4)+4*[(n+1) mod 4]+2*[(n+2) mod 4]+18*[(n+3) mod 4]-31*[C(2*n,n) mod 2], with n>=0 [From Paolo P. Lava, Jun 03 2009]

G.f.: -(31*x^4+2*x^3+6*x^2+2*x+31)/((x-1)*(x+1)*(x^2+1)). [Colin Barker, Aug 11 2012]

MAPLE

with(numtheory): Digits := 300: convert(evalf(sqrt(990)), confrac);

CROSSREFS

Sequence in context: A040956 A051315 A040957 * A040959 A040960 A040946

Adjacent sequences:  A040955 A040956 A040957 * A040959 A040960 A040961

KEYWORD

nonn,cofr,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified February 20 06:26 EST 2019. Contains 320332 sequences. (Running on oeis4.)