id:A144663 - OEIS Search Results

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Decimal expansion of product_{n=2..infinity} (n^4-1)/(n^4+1).

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8, 4, 8, 0, 5, 4, 0, 4, 9, 3, 5, 2, 9, 0, 0, 3, 9, 2, 1, 2, 9, 6, 5, 0, 1, 8, 3, 4, 0, 5, 0, 0, 7, 7, 0, 5, 8, 4, 7, 9, 8, 7, 4, 8, 6, 8, 8, 4, 7, 1, 7, 6, 6, 6, 4, 3, 0, 6, 9, 6, 4, 5, 3, 8, 0, 6, 6, 1, 3, 5, 7, 2, 8, 5, 5, 5, 5, 4, 4, 1, 2, 7, 1, 3, 6, 7, 6, 6, 3, 7, 6, 7, 3 (list; cons; graph; listen)

	OFFSET	`0,1`
	LINKS	`J. Borwein et al., Experimentation in Mathematics, 2004, section 1.2.` `E. W. Weisstein, Infinite Product, MathWorld.`
	EXAMPLE	`0.8480540493529003921296501834...`
	MAPLE	`Digits := 120 :` `m := 1:` `for r from 2 to 10 do` `omega := cos(Pi/r)+Isin(Pi/r) :` `x := (-1)^(m+1)2mm!/rmul( GAMMA(-momega^j)^(-(-1)^j), j=1..2*r-1) ;` `x := Re(evalf(x)) ;` `print(r, x) ;` `od:`
	CROSSREFS	`Cf. A090986.` `Sequence in context: A110233 A019684 A019867 this_sequence A155889 A083948 A021848` `Adjacent sequences: A144660 A144661 A144662 this_sequence A144664 A144665 A144666`
	KEYWORD	`nonn,cons`
	AUTHOR	`R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 01 2009`

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Last modified December 21 10:15 EST 2009. Contains 171081 sequences.

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