A146493 Decimal expansion of Product_{q in A001358} (1-1/(q^4*(q-1))).

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

Offset

0,1

Comments

Semiprime analog of A065416.

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=4, where P_k(s) are the k-almost prime zeta functions of arXiv:0803.0900.

Example

0.998509500607573754... = (1-1/768)*(1-1/6480)*(1-1/52488)*..

Crossrefs

Sequence in context: A347057 A334446 A051554 * A347055 A371465 A346727

Adjacent sequences: A146490 A146491 A146492 * A146494 A146495 A146496

Keyword

nonn,cons,less

Author

R. J. Mathar, Feb 13 2009

Status

approved