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A040620 Continued fraction for sqrt(646). 1
25, 2, 2, 2, 50, 2, 2, 2, 50, 2, 2, 2, 50, 2, 2, 2, 50, 2, 2, 2, 50, 2, 2, 2, 50, 2, 2, 2, 50, 2, 2, 2, 50, 2, 2, 2, 50, 2, 2, 2, 50, 2, 2, 2, 50, 2, 2, 2, 50, 2, 2, 2, 50, 2, 2, 2, 50, 2, 2, 2, 50, 2, 2, 2, 50, 2, 2, 2, 50, 2, 2, 2, 50, 2, 2, 2, 50, 2, 2, 2, 50, 2, 2, 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)=(1/24)*{-209*(n mod 4)+205*[(n+1) mod 4]-59*[(n+2) mod 4]+355*[(n+3) mod 4]}-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(646)), confrac);

CROSSREFS

Sequence in context: A040617 A065781 A040616 * A040621 A006852 A040622

Adjacent sequences:  A040617 A040618 A040619 * A040621 A040622 A040623

KEYWORD

nonn,cofr,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified January 17 06:12 EST 2022. Contains 350378 sequences. (Running on oeis4.)