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A156648 Decimal expansion of prod_{k>=1} (1+1/k^2). +0
1
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; cons; graph; listen)
OFFSET

1,1

COMMENT

Square root of A084243.

FORMULA

Equals sinh(Pi)/Pi.

Equals 1/A090986. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Mar 05 2009]

EXAMPLE

3.676077910374977720 = (1+1)*(1+1/4)*(1+1/9)*(1+1/16)*(1+1/25)*...

MAPLE

evalf(sinh(Pi)/Pi) ;

CROSSREFS

Sequence in context: A162195 A117361 A165952 this_sequence A016616 A021276 A067753

Adjacent sequences: A156645 A156646 A156647 this_sequence A156649 A156650 A156651

KEYWORD

cons,easy,nonn

AUTHOR

R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 12 2009

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.


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