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 A144664 #18 Feb 16 2025 08:33:09
%S A144664 9,2,8,7,8,6,9,3,5,7,9,9,5,5,2,4,5,3,7,5,1,4,6,9,9,1,5,6,5,2,8,5,2,3,
%T A144664 5,1,9,3,2,0,1,0,1,5,0,3,7,5,3,0,4,1,1,8,2,0,1,0,2,8,2,6,5,1,4,8,7,2,
%U A144664 0,0,7,3,7,9,9,1,6,0,2,2,3,8,8,2,7,4,1,5,5,1,8,1,0,8,4,1,9,2,7,8,2,5,1,0,5,9,7,2,6,2
%N A144664 Decimal expansion of Product_{n>=2} (n^5-1)/(n^5+1).
%H A144664 J. Borwein et al., <a href="http://www.ams.org/mathscinet-getitem?mr=2051473">Experimentation in Mathematics</a>, 2004, section 1.2.
%H A144664 E. W. Weisstein, <a href="https://mathworld.wolfram.com/InfiniteProduct.html">Infinite Product</a>, MathWorld.
%e A144664 0.92878693579955245375146991...
%t A144664 p = 2*Gamma[2-(-1)^(1/5)] * Gamma[2+(-1)^(2/5)] * Gamma[2-(-1)^(3/5)] * Gamma[2+(-1)^(4/5)] / (Gamma[2+(-1)^(1/5)] * Gamma[2-(-1)^(2/5)] * Gamma[2+(-1)^(3/5)] * Gamma[2-(-1)^(4/5)]); RealDigits[Re[p], 10, 110][[1]] (* _Jean-François Alcover_, Feb 11 2013, updated Nov 18 2015 *)
%t A144664 RealDigits[Re[N[Product[(n^5 - 1)/(n^5 + 1), {n, 2, Infinity}], 110]]][[1]] (* _Bruno Berselli_, Apr 02 2013 *)
%Y A144664 Cf. A090986, A255435.
%K A144664 nonn,cons
%O A144664 0,1
%A A144664 _R. J. Mathar_, Feb 01 2009
%E A144664 More terms from _Jean-François Alcover_, Feb 11 2013