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A040613 Continued fraction for sqrt(639). +0
1
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; listen)
OFFSET

0,1

LINKS

Index entries for continued fractions for constants

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 (ppl(AT)spl.at), May 15 2009]

MAPLE

with(numtheory): Digits := 300: convert(evalf(sqrt(639)), confrac);

CROSSREFS

Sequence in context: A040623 A094582 A040624 this_sequence A040612 A040614 A040615

Adjacent sequences: A040610 A040611 A040612 this_sequence A040614 A040615 A040616

KEYWORD

nonn,cofr,easy

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.


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