This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A154943 #6 Jul 23 2013 15:15:51
%S A154943 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,
%T A154943 8,2,2,7,2,3,1,1,9,0,2,0,8,4,9,0,8,6,0,3
%N A154943 Decimal expansion of the negated value of the sum_q [log(1-1/q)+1/q] over the semiprimes q.
%C A154943 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.
%F A154943 Equals the negative of Sum_{i>=1} ( log(1-1/A001358(i)) +1/A001358(i)).
%e A154943 Equals 0.079848040306232691897402254...
%K A154943 cons,nonn
%O A154943 0,2
%A A154943 _R. J. Mathar_, Jan 17 2009