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 A154932 #10 Mar 23 2024 20:05:52
%S A154932 0,7,1,6,0,6,0,1,5,3,6,4,0,6,2,9,5,0,6,8,9,0,1,4,9,0,5,2,3,3,2,7,8,5,
%T A154932 7,0,0,3,2,9,7,7,5,7,7,4,9,6,7,6,4,7,6,6,9,9,6,8,8,1,5
%N A154932 Decimal expansion of Sum_{q in A006881} 1/(q(q-1)) over the squarefree semiprimes q.
%C A154932 A variant of A152447.
%H A154932 R. J. Mathar, <a href="http://arxiv.org/abs/0803.0900">Series of reciprocal powers of k-almost primes</a>, arXiv:0803.0900 [math.NT], 2008-2009; see Table 9.
%F A154932 Equals Sum_{j>=1} 1/(A006881(j)*(A006881(j)-1)) = A152447 - Sum_{p in A000040} 1/(p^2*(p^2-1)) = A152447 + A085548 - Sum_{p in A000040} 1/(p^2-1).
%e A154932 Equals 0.071606015364062950... = 1/(6*5) + 1/(10*9) + 1/(14*13) + 1/(15*14) + ...
%K A154932 cons,nonn,more
%O A154932 0,2
%A A154932 _R. J. Mathar_, Jan 17 2009