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A021085
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Decimal expansion of 1/81.
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6
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0, 1, 2, 3, 4, 5, 6, 7, 9, 0, 1, 2, 3, 4, 5, 6, 7, 9, 0, 1, 2, 3, 4, 5, 6, 7, 9, 0, 1, 2, 3, 4, 5, 6, 7, 9, 0, 1, 2, 3, 4, 5, 6, 7, 9, 0, 1, 2, 3, 4, 5, 6, 7, 9, 0, 1, 2, 3, 4, 5, 6, 7, 9, 0, 1, 2, 3, 4, 5, 6, 7, 9, 0, 1, 2, 3, 4, 5, 6, 7, 9, 0, 1, 2, 3, 4, 5, 6, 7, 9, 0, 1, 2, 3, 4, 5, 6, 7, 9
(list; constant; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| The decimal expansion of Sum_{n>=1} floor(n * tanh(Pi))/10^n is the same as that of 1/81 for the first 268 decimal places [Borwein et al.]
Sqrt[999999999999999999] = 9*Sqrt[12345679012345679]. - Ryohei Miyadera, Ken Hirotomi, Hiroyuki Ozaki and Atushi Tanaka (miyadera1272000(AT)yahoo.co.jp), Jan 16 2006
Equals Sum_{k = 1 to infinity} (1/2^k)*(1/5^k)*k. [From Eric Desbiaux (moongerms(AT)wanadoo.fr), Mar 11 2009]
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REFERENCES
| J. Borwein, D. Bailey and R. Girgensohn, Experimentation in Mathematics: Computational Paths to Discovery, Peters, Boston, 2004. See Sect. 1.4.
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CROSSREFS
| Sequence in context: A004903 A004914 A084689 * A031006 A031978 A065306
Adjacent sequences: A021082 A021083 A021084 * A021086 A021087 A021088
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KEYWORD
| nonn,cons
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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