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Search: id:A095823
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| A095823 |
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Denominators of certain upper bounds for Euler's number e. |
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+0
2
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| 1, 4, 18, 32, 600, 4320, 11760, 322560, 3265920, 1728000, 439084800, 821145600, 817689600, 1220496076800, 19615115520000, 111588212736000, 863812325376000, 115242726703104000, 15722836107264000, 3742926166425600000
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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For the numerators see A095822.
e:=sum(1/k!,k=0..infty) has (trivial) upper bound r(n):= A095822(n)/a(n), for every n>=1. See the W. Lang link.
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REFERENCES
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M. Barner and F. Flohr, Analysis I, de Gruyter, 5te Auflage, 2000; pp. 117/8.
E. Kuz'min and A. I. Shirshov: On the number e, pp. 111-119, eq.(6), in: Kvant Selecta: Algebra and Analysis, I, ed. S. Tabachnikov, Am.Math.Soc., 1999
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LINKS
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W. Lang, r(n) numbers and comments.
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FORMULA
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a(n)= denominator(r(n)), with rational r(n):= sum(1/k!, k=0..n) + 1/(n*n!), n>=1, written in lowest terms. For n*n! see A001563(n).
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EXAMPLE
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The positive rationals r(n), n>=1: 3/1, 11/4, 49/18, 87/32, 1631/600, 11743/4320, 31967/11760, ...
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CROSSREFS
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Sequence in context: A130656 A053191 A003474 this_sequence A092116 A083969 A110621
Adjacent sequences: A095820 A095821 A095822 this_sequence A095824 A095825 A095826
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KEYWORD
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nonn,easy,frac
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AUTHOR
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Wolfdieter Lang (wolfdieter.lang_AT_physik_DOT_uni-karlsruhe_DOT_de), Jun 11 2004
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