A146490 Decimal expansion of Product_{q in A001358} (1-1/(q^3*(q-1))).

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

Offset

0,1

Comments

Semiprime analog of A065415.

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_2(s)/j at r=3, where P_k(s) are the k-almost prime zeta functions of arXiv:0803.0900.

Example

0.993521589710505460675409269.. = (1-1/192)*(1-1/1080)*(1-1/5832)*...

Crossrefs

Sequence in context: A011211 A074879 A291366 * A222810 A140416 A340628

Adjacent sequences: A146487 A146488 A146489 * A146491 A146492 A146493

Keyword

nonn,cons,less

Author

R. J. Mathar, Feb 13 2009

Status

approved