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 A345987 #14 Jul 12 2021 14:55:05
%S A345987 1,8,9,9,1,9,3,2,4,3,9,1,0,8,8,0,6,7,9,4,4,8,2,8,3,2,0,6,9,8,1,2,5,1,
%T A345987 2,0,7,9,1,9,9,4,8,2,7,1,0,0,9,0,6,9,9,2,1,9,8,0,6,9,2,1,4,7,9,7,2,7,
%U A345987 8,8,9,0,9,6,5,6,8,1,4,2,8,6,6,9,5,6,1,8,8,1,1,3,1,4,1,6,3,3,7,5,5,5,5,6
%N A345987 Decimal expansion of constant mu(ell) arising in study of complexity of Euclidean algorithm.
%C A345987 The constant is (12/Pi^2)*log(Product_{i>=0} (1+1/2^i)).
%D A345987 Lhote, Loïck, and Brigitte Vallée. "Sharp estimates for the main parameters of the Euclid Algorithm." In Latin American Symposium on Theoretical Informatics, pp. 689-702. Springer, Berlin, Heidelberg, 2006.
%F A345987 Equals 12*log(QPochhammer(-1,1/2))/Pi^2. - _Stefano Spezia_, Jul 12 2021
%e A345987 1.89919324391088067944828320698125120791994827100906...
%p A345987 evalf(12/Pi^2*log(product(1+1/2^i, i=0..infinity)), 120); # _Alois P. Heinz_, Jul 12 2021
%t A345987 RealDigits[(12/Pi^2)*Log[Product[1 + 1/2^i, {i, 0, Infinity}]], 10, 105][[1]] (* _Amiram Eldar_, Jul 12 2021 *)
%Y A345987 Cf. A081845.
%K A345987 nonn,cons
%O A345987 1,2
%A A345987 _N. J. A. Sloane_, Jul 12 2021