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 A211074 #81 Feb 13 2023 03:05:36 %S A211074 7,7,3,2,3,9,5,4,4,7,3,5,1,6,2,6,8,6,1,5,1,0,7,0,1,0,6,9,8,0,1,1,4,8, %T A211074 9,6,2,7,5,6,7,7,1,6,5,9,2,3,6,5,1,5,8,9,9,8,1,3,3,8,7,5,2,4,7,1,1,7, %U A211074 4,3,8,1,0,7,3,8,1,2,2,8,0,7,2,0,9,1,0 %N A211074 Decimal expansion of 4/Pi - 1/2. %C A211074 Equivalent resistance between two nodes on an infinite rectangular lattice of ideal unit resistors, where the nodes are separated by two resistors along one axis and one resistor on the other. %H A211074 Ivan Panchenko, <a href="/A211074/b211074.txt">Table of n, a(n) for n = 0..1000</a> %H A211074 Author?, <a href="http://sites.google.com/site/resistorgrid/">Infinite 2D square grid of 1-ohm resistors</a>, April 30 2004. %H A211074 D. Atkinson and F. J. van Steenwijk, <a href="http://pds4.egloos.com/pds/200708/06/25/resist-zariski.pdf">Infinite resistive lattices</a>, Aug 14 1998. %H A211074 D. Atkinson and F. J. van Steenwijk, <a href="http://dx.doi.org/10.1119/1.19311">Infinite resistive lattices</a>, Am. J. Phys. 67 (1999), 486-492. %H A211074 Matthew Beckler, <a href="http://www.mbeckler.org/resistor_grid/">Infinite Grid of Resistors - Solution by Simulation</a>, Dec 16 2009. %H A211074 Kevin Brown, <a href="http://www.mathpages.com/home/kmath668/kmath668.htm">Infinite Grid of Resistors</a>. %H A211074 J. Cserti, <a href="http://arxiv.org/abs/cond-mat/9909120">Application of the lattice Green's function for calculating the resistance of an infinite networks of resistors</a>, arXiv:cond-mat/9909120 [cond-mat.mes-hall], 1999-2000. %H A211074 Peter G. Doyle and J. Laurie Snell, <a href="http://www.math.dartmouth.edu/~doyle/docs/walks/walks.pdf">Random walks and electric networks</a> (2006), section 1.1.4. %H A211074 Alan Eustace, <a href="http://web.archive.org/web/20041103095002/http://www.google.com/googleblog/2004/09/pencils-down-people.html">Pencils down, people</a> (official Google Blog article, archived on archive.org), Sep 30 2004. %H A211074 Randall Munroe, <a href="http://xkcd.com/356/">Nerd Sniping</a>, xkcd Web Comic #356, Dec 12 2007. %H A211074 Michael Pusateri, <a href="http://cruftbox.com/blog/archives/001031.html">Google Labs Aptitude Test</a>, Sep 13 2004. %H A211074 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a> %e A211074 0.77323954473516268615107010698011489627567716592365158998133875247117... %t A211074 RealDigits[4/Pi - 1/2, 10, 87][[1]] (* modified by _Harvey P. Dale_, Jan 14 2015 *) %o A211074 (PARI) 4/Pi-1/2 %Y A211074 Cf. A088538, A355565. %K A211074 nonn,cons %O A211074 0,1 %A A211074 _Charles R Greathouse IV_, May 02 2012