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A042300 Numerators of continued fraction convergents to sqrt(677). 2
26, 1353, 70382, 3661217, 190453666, 9907251849, 515367549814, 26809019842177, 1394584399343018, 72545197785679113, 3773744869254656894, 196307278399027837601, 10211752221618702212146, 531207422802571542869193, 27632997737955338931410182 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

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

Tanya Khovanova, Recursive Sequences

Index entries for linear recurrences with constant coefficients, signature (52, 1).

FORMULA

a(n) = 52*a(n-1)+a(n-2) for n>1, a(0)=26, a(1)=1353. G.f.: (26+x)/(1-52*x -x^2). [Philippe Deléham, Nov 23 2008]

a(n) = 13*((26+sqrt(677))^n+(26-sqrt(677))^n)+(1/2)*sqrt(677)*((26+sqrt(677))^n-(26-sqrt(677))^n). [Paolo P. Lava, Nov 28 2008]

MATHEMATICA

Numerator[Convergents[Sqrt[677], 30]] (* or *) LinearRecurrence[{52, 1}, {26, 1353}, 30] (* Harvey P. Dale, Nov 09 2011 *)

PROG

(MAGMA) I:=[26, 1353]; [n le 2 select I[n] else 52*Self(n-1)+Self(n-2): n in [1..30]]; // Vincenzo Librandi, Nov 21 2013

CROSSREFS

Cf. A042301, A040650.

Sequence in context: A106710 A114052 A042303 * A282884 A080163 A300578

Adjacent sequences:  A042297 A042298 A042299 * A042301 A042302 A042303

KEYWORD

nonn,cofr,frac,easy

AUTHOR

N. J. A. Sloane.

EXTENSIONS

Additional term from Colin Barker, Dec 07 2013

STATUS

approved

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Last modified September 23 23:21 EDT 2018. Contains 315306 sequences. (Running on oeis4.)