A042323 - OEIS

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A042323

Denominators of continued fraction convergents to sqrt(688).

1, 4, 9, 13, 74, 531, 1667, 12200, 62667, 74867, 212401, 924471, 48284893, 194064043, 436412979, 630477022, 3588798089, 25752063645, 80844989024, 591666986813, 3039179923089, 3630846909902, 10300873742893, 44834341881474, 2341686651579541, 9411580948199638

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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, 48497294, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1).

FORMULA

a(n) = 48497294*a(n-12) - a(n-24) for n>23. - Vincenzo Librandi, Jan 20 2014

MATHEMATICA

Denominator[Convergents[Sqrt[688], 30]] (* Vincenzo Librandi, Jan 20 2014 *)

CROSSREFS

Cf. A042322 (numerators).