OFFSET
0,1
COMMENTS
Semiprime analog of A136271. The absolute value of the first derivative of the semiprime zeta function at 2.
LINKS
R. J. Mathar, Series of reciprocal powers of k-almost primes, arXiv:0803.0900 [math.NT], 2008-2009; see Table 4.
EXAMPLE
Equals 0.283606815... = log(4)/16 + log(6)/36 + log(9)/81 + ....
CROSSREFS
KEYWORD
AUTHOR
R. J. Mathar, Jan 17 2009
STATUS
approved