id:A117508 - OEIS Search Results

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Denominators of partial sums of the Brun series divided by 5.

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3, 21, 3003, 969969, 872002131, 1537339756953, 5532885785273847, 28676947025074349001, 298326279901848452657403, 3479379402495258503343291189, 66257821961717207679166294112127 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Numerators divided by 4 are given by A117507.` `See A117507 for more information.`
	FORMULA	`a(n)=denominator(r(n))/5, with r(n):=sum(1/ltp(k) + 1/(ltp(k)+2),k=1..n), n>=1, with ltp(k):=A001359(k) (lesser twin primes).`
	CROSSREFS	`Sequence in context: A077260 A012110 A054739 this_sequence A001139 A016449 A161377` `Adjacent sequences: A117505 A117506 A117507 this_sequence A117509 A117510 A117511`
	KEYWORD	`nonn,easy,frac`
	AUTHOR	`Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de), Apr 13 2006`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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