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 A359454 #5 Jan 02 2023 03:32:44
%S A359454 2,2,9,2,1,7,3,6,9,5,3
%N A359454 Decimal expansion of Knopfmacher's limit: Limit_{x -> 1 from below} (1/(1-x)) * Product_{k>=2} (1 - x^m(k)/(k+1)), where m(k) = A060681(k) = k - k/A020639(k).
%C A359454 The problem of calculating this limit was proposed by Knopfmacher (1999) and its value was calculated by Lichtblau (2000).
%H A359454 Folkmar Bornemann, Dirk Laurie, Stan Wagon, and Jörg Waldvogel, <a href="https://www-m3.ma.tum.de/m3old/bornemann/challengebook/">The SIAM 100-Digit Challenge, A Study in High-Accuracy Numerical Computing</a>, SIAM, Philadelphia, 2004. See <a href="https://www-m3.ma.tum.de/m3old/bornemann/challengebook/AppendixD/AppendixD.pdf">Appendix D</a>, Problem 3, p. 282.
%H A359454 Arnold Knopfmacher, <a href="http://forums.wolfram.com/mathgroup/archive/1999/Jan/msg00023.html">A tricky limit</a>, Usenet news group post to comp.soft-sys.math.mathematica, 1999.
%H A359454 Daniel Lichtblau, <a href="https://www-m3.ma.tum.de/m3old/bornemann/challengebook/AppendixD/">The evaluation of Knopfmacher's curious limit</a>, Wolfram Research, Inc., Note of August 2000.
%H A359454 Daniel Lichtblau, <a href="https://library.wolfram.com/infocenter/Conferences/7519/">Computing Knopfmacher's Limit, or My First Foray into Computational Mathematics, Reprise</a>, Wolfram Research, Inc., 2009.
%e A359454 2.2921736953...
%Y A359454 Cf. A020639, A060681.
%K A359454 nonn,cons,more
%O A359454 1,1
%A A359454 _Amiram Eldar_, Jan 02 2023