A041771 Denominators of continued fraction convergents to sqrt(406).

1, 6, 7, 20, 87, 629, 716, 3493, 4209, 32956, 136033, 305022, 441055, 2951352, 118495135, 713922162, 832417297, 2378756756, 10347444321, 74810867003, 85158311324, 415444112299, 500602423623, 3919661077660, 16179246734263, 36278154546186

Offset

0,2

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..200

Index entries for linear recurrences with constant coefficients, signature (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 118936190, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1).

Formula

a(n) = 118936190*a(n-14) - a(n-28) for n>27, - Vincenzo Librandi, Dec 24 2013

Mathematica

Denominator[Convergents[Sqrt[406], 30]] (* Harvey P. Dale, Sep 15 2011 *)

Crossrefs

Cf. A041770.

Sequence in context: A078980 A041076 A358059 * A042757 A257312 A062369

Adjacent sequences: A041768 A041769 A041770 * A041772 A041773 A041774

Keyword

nonn,frac,easy

Author

N. J. A. Sloane.

Extensions

More terms from Vincenzo Librandi, Dec 24 2013

Status

approved