A154943 Decimal expansion of the negated value of the sum_q [log(1-1/q)+1/q] over the semiprimes q.

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

Offset: 0

Author

R. J. Mathar, Jan 17 2009

Keywords

• cons
• nonn

Comments

The semiprime analog of A143524. Taylor expansion of the logarithm shows that the value is sum_{s=2,3,..,infinity} P_2(s)/s, where P_2(s) are the semiprime zeta functions in Table 3 of the preprint arXiv:0803.0900. P_2(2)=A117543 and P_2(3)=0.023806..., P_2(4)=0.004994... etc.

Examples

			Equals 0.079848040306232691897402254...
		

Formula

Equals the negative of Sum_{i>=1} ( log(1-1/A001358(i)) +1/A001358(i)).