0,1

4-almost prime analog of A065414.

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=2, where P_k(s) are the k-almost prime zeta functions of arXiv:0803.0900.

0.99959527858653553563... = (1-1/3840)*(1-1/13248)*(1-1/45360)*(1-1/62400)*..

Sequence in context: A019897 A111613 A111591 this_sequence A051557 A146491 A112118

Adjacent sequences: A146485 A146486 A146487 this_sequence A146489 A146490 A146491

nonn,cons,less

R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 13 2009