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A041801
Denominators of continued fraction convergents to sqrt(421).
2
1, 1, 2, 27, 137, 164, 629, 793, 2215, 3008, 5223, 8231, 21685, 203396, 225081, 1778963, 5561970, 18464873, 42491716, 103448305, 352836631, 1161958198, 8486544017, 9648502215, 95323063952, 200294630119, 295617694071, 495912324190, 791530018261, 2078972360712
OFFSET
0,3
LINKS
Index entries for linear recurrences with constant coefficients, signature (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 88084891393642836, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1).
FORMULA
a(n) = 88084891393642836*a(n-37) + a(n-74) for n>73. - Vincenzo Librandi, Dec 24 2013
MATHEMATICA
Denominator[Convergents[Sqrt[421], 30]] (* Vincenzo Librandi, Dec 24 2013 *)
CROSSREFS
Cf. A041800.
Sequence in context: A046735 A038625 A280089 * A166942 A119351 A098627
KEYWORD
nonn,frac,easy
AUTHOR
EXTENSIONS
More terms from Vincenzo Librandi, Dec 24 2013
STATUS
approved