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 A156648 Decimal expansion of prod_{k>=1} (1+1/k^2). 6
 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 FORMULA Equals sinh(Pi)/Pi. Equals 1/A090986. - R. J. Mathar, Mar 05 2009 Binomial(2, 1+i) = 1/(i!*(-i)!) (where x! means Gamma(x+1)). - Robert G. Wilson v, Feb 23 2015 EXAMPLE Equals 3.676077910374977720695697492028260666507156346827630277478003593557447324111... = (1+1)*(1+1/4)*(1+1/9)*(1+1/16)*(1+1/25)*... MAPLE evalf(sinh(Pi)/Pi) ; MATHEMATICA RealDigits[ Sinh[Pi]/Pi, 10, 111][[1]] (* or *) RealDigits[ Re[ 1/(I!*(-I)!)], 10, 111][[1]] (* Robert G. Wilson v, Feb 23 2015 *) PROG (PARI) sinh(Pi)/Pi \\ Charles R Greathouse IV, Dec 16 2013 CROSSREFS Cf. A073017, A258870, A258871. Sequence in context: A228787 A245220 A165952 * A278688 A016616 A256936 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 August 20 16:45 EDT 2018. Contains 313924 sequences. (Running on oeis4.)