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A041903
Denominators of continued fraction convergents to sqrt(473).
2
1, 1, 3, 4, 171, 175, 521, 696, 29753, 30449, 90651, 121100, 5176851, 5297951, 15772753, 21070704, 900742321, 921813025, 2744368371, 3666181396, 156723987003, 160390168399, 477504323801, 637894492200, 27269072996201, 27906967488401, 83083007973003
OFFSET
0,3
LINKS
FORMULA
G.f.: -(x^2-x-1)*(x^4+4*x^2+1) / (x^8-174*x^4+1). - Colin Barker, Nov 27 2013
a(n) = 174*a(n-4) - a(n-8) for n>7. - Vincenzo Librandi, Dec 26 2013
MATHEMATICA
Denominator[Convergents[Sqrt[473], 30]] (* Vincenzo Librandi, Dec 26 2013 *)
PROG
(Magma) I:=[1, 1, 3, 4, 171, 175, 521, 696]; [n le 8 select I[n] else 174*Self(n-4)-Self(n-8): n in [1..50]]; // Vincenzo Librandi, Dec 26 2013
CROSSREFS
Sequence in context: A370385 A041595 A041741 * A156513 A082213 A097172
KEYWORD
nonn,frac,easy
AUTHOR
EXTENSIONS
More terms from Colin Barker, Nov 27 2013
STATUS
approved