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A127814
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a(n) = numerator of b(n), where b(1) = 2, b(n) = b(n-1) - 1/b(n-1).
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4
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2, 3, 5, -11, 779, 497941, 181860254581, 16687694789137362648661, -263439569256003706800705587722279993788907979, 81512663708476146329709015825571064954724426915346799560162522434680208602364731247764459
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OFFSET
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1,1
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COMMENTS
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Every term of this sequence of numerators is coprime to every other term.
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LINKS
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Table of n, a(n) for n=1..10.
Clark Kimberling, Polynomials associated with reciprocation, JIS 12 (2009) 09.3.4
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EXAMPLE
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The b() sequence is 2, 3/2, 5/6, -11/30, 779/330, 497941/257070, 181860254581/128005692870, ...
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MATHEMATICA
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f[l_List] := Append[l, l[[ -1]] - 1/l[[ -1]]]; Numerator[Nest[f, {2}, 10]] (*Chandler*)
Numerator/@NestList[#-1/#&, 2, 10] (* Harvey P. Dale, Apr 30 2011 *)
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CROSSREFS
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Cf. A127815.
Sequence in context: A195815 A220346 A242995 * A162253 A321855 A112978
Adjacent sequences: A127811 A127812 A127813 * A127815 A127816 A127817
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KEYWORD
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easy,frac,sign
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AUTHOR
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Leroy Quet, Jan 30 2007
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EXTENSIONS
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Extended by Ray Chandler, Feb 07 2007
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STATUS
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approved
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