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 A292887 #7 Feb 16 2025 08:33:51
%S A292887 1,0,0,0,0,8,0,7,0,6,0,3,1,0,3,3,6,2,2,5,4,7,6,3,3,7,5,3,8,2,7,4,8,1,
%T A292887 5,1,0,3,4,3,8,0,8,2,4,1,6,3,6,3,3,6,6,4,5,9,2,2,7,2,2,0,8,5,1,3,3,1,
%U A292887 1,2,1,5,7,3,8,8,1,4,9,1,7,5,2,0,4,2,3,9,8,1,4,8,8,2,5,5,8,5,2,7,4,8,2,5,5
%N A292887 Decimal expansion of Product_{k>=1} (1 + exp(-3*Pi*k)).
%H A292887 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/DedekindEtaFunction.html">Dedekind Eta Function</a>
%H A292887 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/q-PochhammerSymbol.html">q-Pochhammer Symbol</a>
%H A292887 Wikipedia, <a href="https://en.wikipedia.org/wiki/Dedekind_eta_function">Dedekind eta function</a>
%H A292887 Wikipedia, <a href="https://en.wikipedia.org/wiki/Euler_function">Euler function</a>
%F A292887 Equals (sqrt(9 + 6*sqrt(3)) - 2 - sqrt(3))^(1/3) * exp(Pi/8) / 2^(3/8).
%e A292887 1.000080706031033622547633753827481510343808241636336645922722085133112...
%t A292887 RealDigits[(Sqrt[9 + 6*Sqrt[3]] - 2 - Sqrt[3])^(1/3) * E^(Pi/8)/ 2^(3/8), 10, 120][[1]]
%t A292887 RealDigits[QPochhammer[-1, E^(-3*Pi)]/2, 10, 120][[1]]
%Y A292887 Cf. A292819, A292820, A292821, A292822, A292888.
%K A292887 nonn,cons
%O A292887 1,6
%A A292887 _Vaclav Kotesovec_, Sep 26 2017