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A154928
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Decimal expansion of sum_{q in A001358} log(q)/q^2 over the semiprimes q = 4,6,9,...
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1
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2, 8, 3, 6, 0, 6, 8, 1, 5, 4, 0, 7, 9, 8, 0, 6, 5, 2, 2, 2, 4, 2, 5, 8, 2, 2, 2, 5, 4, 8, 2, 7, 8, 3, 3, 6, 0, 7, 9, 3, 5, 0, 5, 7, 8, 2, 3, 7, 8, 1, 4, 0, 1, 3, 4, 1, 1, 1, 1
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OFFSET
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0,1
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COMMENTS
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Semiprime analog of A136271. The absolute value of the first derivative of the semiprime zeta function at 2.
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LINKS
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Table of n, a(n) for n=0..58.
R. J. Mathar, Series of reciprocal powers of k-almost primes, arXiv:0803.0900 [math.NT], Table 4.
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FORMULA
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Equals sum_{i=1,2,..,infinity} log(A001358(i))/A074985(i) .
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EXAMPLE
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Equals 0.283606815... = log(4)/16+log(6)/36+log(9)/81+....
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CROSSREFS
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Sequence in context: A011431 A173823 A222296 * A201394 A169844 A076123
Adjacent sequences: A154925 A154926 A154927 * A154929 A154930 A154931
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KEYWORD
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cons,nonn
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AUTHOR
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R. J. Mathar, Jan 17 2009
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STATUS
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approved
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