A120834 - OEIS

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A120834

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

4

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

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OFFSET

1,2

COMMENTS

Numerators: A120833(n);

A120833(n)/a(n) = Sum(A001358(n)/A068318(n):1<=k<=n).

LINKS

Table of n, a(n) for n=1..25.

EXAMPLE

n=5: 2*2/(2+2)+2*3/(2+3)+3*3/(3+3)+2*5/(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.

Sequence in context: A180851 A056316 A156102 * A089745 A356820 A358491

Adjacent sequences: A120831 A120832 A120833 * A120835 A120836 A120837

KEYWORD

nonn,frac

AUTHOR

Reinhard Zumkeller, Jul 24 2006

STATUS

approved