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 A340551 #14 Jan 19 2021 12:46:09
%S A340551 9,1,8,8,3,3,0,9,9,9,2,9,1,4,8,7,2,4,4,2,5,6,6,3,1,5,0,7,5,3,3,9,8,8,
%T A340551 4,7,3,2,7,1,9,3,7,0,6,1,4,4,0,6,9,0,2,4,3,1,3,3,4,8,7,4,1,7,1,3,5,8,
%U A340551 9,6,0,8,3,6,9,8,5,7,1,7,1,2,1,3,1,9,1,8,7
%N A340551 Decimal expansion of 1 / Product_{primes p == 5, 7, 11 (mod 12)} 1/(1 - 1/p^2).
%H A340551 Salma Ettahri, Olivier Ramaré, and Léon Surel, <a href="https://arxiv.org/abs/1908.06808">Fast multi-precision computation of some Euler products</a>, arXiv:1908.06808 [math.NT], 2019.
%H A340551 Étienne Fouvry, Claude Levesque, and Michel Waldschmidt, <a href="http://arxiv.org/abs/1712.09019">Representation of integers by cyclotomic binary forms</a>, arXiv:1712.09019 [math.NT], 2017 and <a href="https://doi.org/10.4064/aa171012-24-12">Acta Arithmetica</a>, online 15 March 2018.
%F A340551 A340551^(-1/2) = A301430 / (3^(1/4)*Pi^(1/2)*log(2+sqrt(3))^(1/4)/(2^(5/4)* Gamma(1/4))), see É. Fouvry et al.
%e A340551 0.9188330999291487244256631507533988473271937061440690243133487417135896...
%t A340551 (* Using _Vaclav Kotesovec_'s function Z from A301430. *)
%t A340551 $MaxExtraPrecision = 1000; digits = 90;
%t A340551 digitize[c_] := RealDigits[Chop[N[c, digits]], 10, digits - 1][[1]];
%t A340551 digitize[(Z[12, 5, 2] Z[12, 7, 2] Z[12, 11, 2])^(-1)]
%Y A340551 Cf. A301430.
%K A340551 nonn,cons
%O A340551 0,1
%A A340551 _Peter Luschny_, Jan 18 2021