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Search: id:A127814
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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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+0
3
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| 2, 3, 5, -11, 779, 497941, 181860254581, 16687694789137362648661, -263439569256003706800705587722279993788907979, 81512663708476146329709015825571064954724426915346799560162522434680208602364731247764459
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Every term of this sequence of numerators is coprime to every other term.
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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*)
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CROSSREFS
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Cf. A127815.
Sequence in context: A137453 A051835 A075883 this_sequence A112978 A002139 A140489
Adjacent sequences: A127811 A127812 A127813 this_sequence 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 (qq-quet(AT)mindspring.com), Jan 30 2007
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EXTENSIONS
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Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Feb 07 2007
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