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A146484

Decimal expansion of Product_{q in A014613} (1-1/(q*(q-1))).

9, 8, 9, 6, 2, 8, 8, 6, 7, 1, 6, 6, 4, 2, 7, 6, 6, 5, 5, 0, 4, 3, 2, 2, 8, 3, 7, 4, 5, 7, 9, 2, 4, 3, 0, 8, 0, 5, 7, 5, 5, 7, 5, 8, 9, 3, 5, 0, 2, 9, 6, 5, 3, 4, 8, 4, 4

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OFFSET

0,1

COMMENTS

4-almost prime analog of A005596.

LINKS

Table of n, a(n) for n=0..56.

FORMULA

The logarithm is -sum_{s>=2} sum_{j=1..floor[s/(1+r)]} binomial(s-r*j-1,j-1)*P_4(s)/j at r=1, where P_k(s) are the k-almost prime zeta functions of arXiv:0803.0900.

EXAMPLE

0.989628867166427665504.. = (1-1/240)*(1-1/552)*...

CROSSREFS

Sequence in context: A200003 A159590 A309642 * A116695 A387443 A109940

Adjacent sequences: A146481 A146482 A146483 * A146485 A146486 A146487

KEYWORD

nonn,cons,less

AUTHOR

R. J. Mathar, Feb 13 2009

STATUS

approved

URL: https://oeis.org/A146484

⇱ A146484 - OEIS