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A041427
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Denominators of continued fraction convergents to sqrt(229).
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10
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1, 7, 8, 15, 113, 3405, 23948, 27353, 51301, 386460, 11645101, 81902167, 93547268, 175449435, 1321693313, 39826248825, 280105435088, 319931683913, 600037119001, 4520191516920, 136205782626601, 957960669903127, 1094166452529728, 2052127122432855
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OFFSET
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0,2
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COMMENTS
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The a(n) terms of this sequence can be constructed with the terms of sequence A154597. For the terms of the periodical sequence of the continued fraction for sqrt(229) see A040213. We observe that its period is five. - Johannes W. Meijer, Jun 12 2010
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LINKS
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Index entries for linear recurrences with constant coefficients, signature (0, 0, 0, 0, 3420, 0, 0, 0, 0, 1).
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FORMULA
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G.f.: -(x^8 -7*x^7 +8*x^6 -15*x^5 +113*x^4 +15*x^3 +8*x^2 +7*x +1) / (x^10 +3420*x^5 -1). - Colin Barker, Nov 12 2013
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MATHEMATICA
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LinearRecurrence[{0, 0, 0, 0, 3420, 0, 0, 0, 0, 1}, {1, 7, 8, 15, 113, 3405, 23948, 27353, 51301, 386460}, 30] (* Harvey P. Dale, Oct 14 2020 *)
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PROG
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(Magma) I:=[1, 7, 8, 15, 113, 3405, 23948, 27353, 51301, 386460]; [n le 10 select I[n] else 3420*Self(n-5)+Self(n-10): n in [1..40]]; // Vincenzo Librandi, Dec 17 2013
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CROSSREFS
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KEYWORD
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nonn,easy,frac
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AUTHOR
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STATUS
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approved
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