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 A200064 #20 Jun 02 2022 05:36:21 %S A200064 1,3,1,8,2,3,4,4,1,5,7,8,6,5,8,8,4,7,2,4,0,2,3,4,0,8,1,6,6,4,5,1,1,3, %T A200064 1,2,1,8,7,1,3,6,2,0,4,8,6,2,7,6,7,7,4,8,8,6,2,2,8,6,6,2,6,7,6,4,7,0, %U A200064 4,7,5,7,6,0,4,2,4,0,1,1,7,9,4,0,5,3,0,8,2,0,1,4,0,6,3,1,4,7 %N A200064 Decimal expansion of the negated value of the digamma function at 2/3. %H A200064 Wikipedia, <a href="http://en.wikipedia.org/wiki/Digamma_function">Digamma function</a> %H A200064 <a href="/index/Di#differential_equations">Index entries for sequences related to the digamma function</a> %F A200064 psi(2/3) = -gamma+Pi*sqrt(3)/6-3*log(3)/2 = A093602 - A047787 = 1.813799 -3.132033... %e A200064 psi(2/3) = -1.3182344157865884724023408166... %t A200064 RealDigits[ -PolyGamma[2/3], 10, 98] // First (* _Jean-François Alcover_, Feb 20 2013 *) %o A200064 (PARI) -psi(2/3) \\ _Charles R Greathouse IV_, Nov 22 2011 %Y A200064 Cf. A020759, A047787, A020777 %K A200064 cons,nonn %O A200064 1,2 %A A200064 _R. J. Mathar_, Nov 13 2011