id:A120834 - OEIS Search Results

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A120834

Denominators of partial sums of (p+q)/p*q, where p and q are primes.

+0
5

1, 5, 10, 70, 630, 2520, 2520, 32760, 32760, 32760, 32760, 622440, 622440, 622440, 1244880, 6224400, 6224400, 6224400, 1556100, 17117100, 530630100, 530630100, 176876700, 176876700, 176876700 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Numerators: A120833(n);` `A120833(n)/a(n) = Sum(A001358(n)/A068318(n):1<=k<=n).`
	EXAMPLE	`n=5: 22/(2+2)+23/(2+3)+33/(3+3)+25/(2+5)+2*7/(2+7) =` `4/4 + 6/5 + 9/6 + 10/7 + 14/9 = 4211/630 = A120833(5)/a(5).`
	CROSSREFS	`Cf. A120836, A120832.` `Adjacent sequences: A120831 A120832 A120833 this_sequence A120835 A120836 A120837` `Sequence in context: A062848 A054884 A056316 this_sequence A089745 A111992 A120598`
	KEYWORD	`nonn,frac`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jul 24 2006`

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.

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