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A040621 Continued fraction for sqrt(647). 0
25, 2, 3, 2, 2, 1, 1, 4, 25, 4, 1, 1, 2, 2, 3, 2, 50, 2, 3, 2, 2, 1, 1, 4, 25, 4, 1, 1, 2, 2, 3, 2, 50, 2, 3, 2, 2, 1, 1, 4, 25, 4, 1, 1, 2, 2, 3, 2, 50, 2, 3, 2, 2, 1, 1, 4, 25, 4, 1, 1, 2, 2, 3, 2, 50, 2, 3, 2, 2, 1, 1, 4, 25, 4, 1, 1, 2, 2, 3, 2, 50, 2, 3, 2, 2, 1, 1, 4 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..87.

Index entries for continued fractions for constants

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

FORMULA

a(n)=(1/128)*{-377*(n mod 16)+15*[(n+1) mod 16]-[(n+2) mod 16]+7*[(n+3) mod 16]-[(n+4) mod 16]+7*[(n+5) mod 16]+31*[(n+6) mod 16]+175*[(n+7) mod 16]-161*[(n+8) mod 16]-17*[(n+9) mod 16]+7*[(n+10) mod 16]+15*[(n+11) mod 16]+7*[(n+12) mod 16]+15*[(n+13) mod 16]-[(n+14) mod 16]+391*[(n+15) mod 16]}-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(647)), confrac);

CROSSREFS

Sequence in context: A065781 A040616 A040620 * A006852 A040622 A040623

Adjacent sequences:  A040618 A040619 A040620 * A040622 A040623 A040624

KEYWORD

nonn,cofr,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified January 27 06:18 EST 2022. Contains 350601 sequences. (Running on oeis4.)