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A156648 Decimal expansion of prod_{k>=1} (1+1/k^2). 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; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Square root of A084243.

REFERENCES

Reinhold Remmert, Classical topics in complex function theory, Vol. 172 of Graduate Texts in Mathematics, p. 12, Springer, 1997.

LINKS

Table of n, a(n) for n=1..105.

FORMULA

Equals sinh(Pi)/Pi.

Equals 1/A090986. [From R. J. Mathar, 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 * A016616 A021276 A067753

Adjacent sequences:  A156645 A156646 A156647 * A156649 A156650 A156651

KEYWORD

cons,easy,nonn

AUTHOR

R. J. Mathar, Feb 12 2009

STATUS

approved

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Last modified May 20 23:29 EDT 2013. Contains 225465 sequences.