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Search: id:A127815
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| A127815 |
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a(n) = denominator 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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| 1, 2, 6, 30, 330, 257070, 128005692870, 23279147893155496537470, 388475314992168993748220639081347493631827670, 10233976964812735872676191846073257681416854843292128735529992974491059186260684\ 7215978930
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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Leroy Quet, Home Page (listed in lieu of email address)
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FORMULA
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For n >=2, a(n) = a(n-1)*A127814(n-1).
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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]]]; Denominator[Nest[f, {2}, 10]] (*Chandler*)
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CROSSREFS
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Cf. A127814.
Sequence in context: A071350 A038696 A064847 this_sequence A054934 A001684 A076926
Adjacent sequences: A127812 A127813 A127814 this_sequence A127816 A127817 A127818
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KEYWORD
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easy,frac,nonn
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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 (rayjchandler(AT)sbcglobal.net), Feb 07 2007
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