

A042209


Denominators of continued fraction convergents to sqrt(630).


2



1, 10, 501, 5020, 251501, 2520030, 126253001, 1265050040, 63378755001, 635052600050, 31816008757501, 318795140175060, 15971573017510501, 160034525315280070, 8017697838781514001, 80337012913130420080, 4024868343495302518001, 40329020447866155600090
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OFFSET

0,2


LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..200
Index to sequences with linear recurrences with constant coefficients, signature (0,502,0,1).


FORMULA

G.f.: (x^210*x1) / (x^4502*x^2+1).  Colin Barker, Dec 04 2013


MATHEMATICA

Denominator[Convergents[Sqrt[630], 30]] (* Vincenzo Librandi, Jan 16 2014_ *)


CROSSREFS

Cf. A042208, A040604.
Sequence in context: A039835 A127947 A095232 * A163703 A218720 A180476
Adjacent sequences: A042206 A042207 A042208 * A042210 A042211 A042212


KEYWORD

nonn,frac,easy


AUTHOR

N. J. A. Sloane.


EXTENSIONS

More terms from Colin Barker, Dec 04 2013


STATUS

approved



