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A156648
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Decimal expansion of prod_{k>=1} (1+1/k^2).
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1
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3, 6, 7, 6, 0, 7, 7, 9, 1, 0, 3, 7, 4, 9, 7, 7, 7, 2, 0, 6, 9, 5, 6, 9, 7, 4, 9, 2, 0, 2, 8, 2, 6, 0, 6, 6, 6, 5, 0, 7, 1, 5, 6, 3, 4, 6, 8, 2, 7, 6, 3, 0, 2, 7, 7, 4, 7, 8, 0, 0, 3, 5, 9, 3, 5, 5, 7, 4, 4, 7, 3, 2, 4, 1, 1, 1, 0, 2, 2, 0, 7, 3, 2, 1, 3, 2, 5, 5, 9, 2, 6, 5, 9, 0, 3, 2, 3, 0, 2, 3, 5, 2, 8, 7, 5
(list; constant; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Square root of A084243.
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REFERENCES
| Reinhold Remmert, Classical topics in complex function theory, Vol. 172 of Graduate Texts in Mathematics, p. 12, Springer, 1997.
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FORMULA
| Equals sinh(Pi)/Pi.
Equals 1/A090986. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Mar 05 2009]
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EXAMPLE
| 3.676077910374977720 = (1+1)*(1+1/4)*(1+1/9)*(1+1/16)*(1+1/25)*...
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MAPLE
| evalf(sinh(Pi)/Pi) ;
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CROSSREFS
| Sequence in context: A162195 A117361 A165952 * A016616 A021276 A067753
Adjacent sequences: A156645 A156646 A156647 * A156649 A156650 A156651
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KEYWORD
| cons,easy,nonn
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AUTHOR
| R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 12 2009
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