

A040006


Continued fraction for sqrt(10).


10



3, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

0,1


COMMENTS

Eventual period is (6).  Zak Seidov, Mar 05 2011
The convergents are given in A005667(n+1)/A005668(n+1), n >= 0.  Wolfdieter Lang, Nov 23 2017


LINKS

Harry J. Smith, Table of n, a(n) for n = 0..20000
G. Xiao, Contfrac
Index entries for continued fractions for constants
Index entries for linear recurrences with constant coefficients, signature (1).


FORMULA

a(n) = 6  3*(binomial(2*n,n) mod 2), with n>=0.  Paolo P. Lava, Jun 11 2009
a(n) = 3 + 3*sign(n). a(n) = 6, n > 0.  Wesley Ivan Hurt, Nov 01 2013


EXAMPLE

3.162277660168379331998893544... = 3 + 1/(6 + 1/(6 + 1/(6 + 1/(6 + ...)))).


MAPLE

Digits := 100: convert(evalf(sqrt(N)), confrac, 90, 'cvgts'):


MATHEMATICA

ContinuedFraction[Sqrt[10], 300] (* Vladimir Joseph Stephan Orlovsky, Mar 04 2011 *)


PROG

(PARI) allocatemem(932245000); default(realprecision, 33000); x=contfrac(sqrt(10)); for (n=0, 20000, write("b040006.txt", n, " ", x[n+1])); \\ Harry J. Smith, Jun 02 2009
(MAGMA) [63*(Binomial(2*n, n) mod 2): n in [0..100]]; // Vincenzo Librandi, Jan 03 2016


CROSSREFS

Cf. A010467 (decimal expansion), A005667(n+1)/A005668(n+1).
Sequence in context: A187601 A113737 A292165 * A155067 A094011 A295558
Adjacent sequences: A040003 A040004 A040005 * A040007 A040008 A040009


KEYWORD

nonn,cofr,easy


AUTHOR

N. J. A. Sloane


STATUS

approved



