id:A128492 - OEIS Search Results

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Denominators of partial sums for a series for (Pi^2)/8.

+0
2

1, 9, 225, 11025, 99225, 12006225, 2029052025, 405810405, 117279207045, 42337793743245, 42337793743245, 22396692890176605, 2799586611272075625, 25196279501448680625, 21190071060718340405625 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Numerators are given in A120268.` `See the comments and the W. Lang link under A120268.`
	FORMULA	`a(n)=denominator(r(n)) with r(n):=sum(1/(2*k-1)^2,k=1..n).`
	CROSSREFS	`Sequence in context: A012831 A012749 A079727 this_sequence A001818 A095363 A138564` `Adjacent sequences: A128489 A128490 A128491 this_sequence A128493 A128494 A128495`
	KEYWORD	`nonn,frac,easy`
	AUTHOR	`Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de) Apr 04 2007`

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Last modified July 24 12:00 EDT 2008. Contains 142294 sequences.

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