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A042237
Denominators of continued fraction convergents to sqrt(644).
2
1, 2, 3, 5, 8, 53, 61, 114, 175, 464, 23375, 47214, 70589, 117803, 188392, 1248155, 1436547, 2684702, 4121249, 10927200, 550481249, 1111889698, 1662370947, 2774260645, 4436631592, 29394050197, 33830681789, 63224731986, 97055413775, 257335559536
OFFSET
0,2
LINKS
Index entries for linear recurrences with constant coefficients, signature (0, 0, 0, 0, 0, 0, 0, 0, 0, 23550, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1).
FORMULA
G.f.: -(x^18 -2*x^17 +3*x^16 -5*x^15 +8*x^14 -53*x^13 +61*x^12 -114*x^11 +175*x^10 -464*x^9 -175*x^8 -114*x^7 -61*x^6 -53*x^5 -8*x^4 -5*x^3 -3*x^2 -2*x -1) / (x^20 -23550*x^10 +1). - Colin Barker, Dec 05 2013
MATHEMATICA
Denominator[Convergents[Sqrt[644], 30]] (* Vincenzo Librandi, Jan 18 2014_ *)
CROSSREFS
Sequence in context: A042471 A041871 A061249 * A042937 A045504 A068500
KEYWORD
nonn,frac,easy
AUTHOR
EXTENSIONS
More terms from Colin Barker, Dec 05 2013
STATUS
approved