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 A086728 #8 Feb 12 2013 08:30:49 %S A086728 2,8,0,4,3,3,2,5,3,4,8,4,0,8,5,9,4,6,7,1,6,4,4,4,5,5,8,3,3,0,3,4,7,6, %T A086728 7,6,6,8,1,0,8,0,6,6,9,9,8,0,0,2,7,1,7,0,6,0,9,4,9,1,2,0,0,0,2,3,0,8, %U A086728 3,9,2,5,3,4,8,4,7,4,5,9,6,5,7,6,4,5,6,3,5,1,9,7,8,4,4,3,8,6,6 %N A086728 Decimal expansion of sum(1/(6*m+2)^2,m=0..infinity). %D A086728 L. Fejes Toth, Lagerungen in der Ebene, auf der Kugel und im Raum, 2nd. ed., Springer-Verlag, Berlin, Heidelberg 1972; see p. 213. %F A086728 Equals A214550 divided by 4. - _R. J. Mathar_, Sep 15 2012 %e A086728 .2804332534840859467... %t A086728 RealDigits[ PolyGamma[1, 1/3]/36, 10, 99] // First (* _Jean-François Alcover_, Feb 12 2013 *) %Y A086728 Cf. A086722-A086731. %K A086728 nonn,cons %O A086728 0,1 %A A086728 _N. J. A. Sloane_, Jul 31 2003