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A041800
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Numerators of continued fraction convergents to sqrt(421).
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2
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20, 21, 41, 554, 2811, 3365, 12906, 16271, 45448, 61719, 107167, 168886, 444939, 4173337, 4618276, 36501269, 114122083, 378867518, 871857119, 2122581756, 7239602387, 23841388917, 174129324806
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OFFSET
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0,1
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LINKS
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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).
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FORMULA
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a(n) = 88084891393642836*a(n-37) + a(n-74) for n>73. [Bruno Berselli, Nov 09 2013]
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MATHEMATICA
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Numerator[Convergents[Sqrt[421], 30]] (* Harvey P. Dale, Mar 28 2012 *)
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CROSSREFS
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KEYWORD
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nonn,cofr,frac,easy,less
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AUTHOR
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STATUS
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approved
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