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A040613 Continued fraction for sqrt(639). 0
25, 3, 1, 1, 2, 4, 4, 1, 4, 1, 4, 4, 2, 1, 1, 3, 50, 3, 1, 1, 2, 4, 4, 1, 4, 1, 4, 4, 2, 1, 1, 3, 50, 3, 1, 1, 2, 4, 4, 1, 4, 1, 4, 4, 2, 1, 1, 3, 50, 3, 1, 1, 2, 4, 4, 1, 4, 1, 4, 4, 2, 1, 1, 3, 50, 3, 1, 1, 2, 4, 4, 1, 4, 1, 4, 4, 2, 1, 1, 3, 50, 3, 1, 1, 2, 4, 4, 1, 4, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..89.

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)=(1/960)*{-2777*(n mod 16)-77*[(n+1) mod 16]+43*[(n+2) mod 16]+103*[(n+3) mod 16]+163*[(n+4) mod 16]+43*[(n+5) mod 16]-137*[(n+6) mod 16]+223*[(n+7) mod 16]-137*[(n+8) mod 16]+223*[(n+9) mod 16]+43*[(n+10) mod 16]-77*[(n+11) mod 16]-17*[(n+12) mod 16]+43*[(n+13) mod 16]+163*[(n+14) mod 16]+2863*[(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(639)), confrac);

CROSSREFS

Sequence in context: A317470 A094582 A040624 * A040612 A040614 A040615

Adjacent sequences:  A040610 A040611 A040612 * A040614 A040615 A040616

KEYWORD

nonn,cofr,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified January 27 03:09 EST 2022. Contains 350601 sequences. (Running on oeis4.)