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A200064 Decimal expansion of the negated value of the digamma function at 2/3. 7

%I #20 Jun 02 2022 05:36:21

%S 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 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 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 Decimal expansion of the negated value of the digamma function at 2/3.

%H Wikipedia, <a href="http://en.wikipedia.org/wiki/Digamma_function">Digamma function</a>

%H <a href="/index/Di#differential_equations">Index entries for sequences related to the digamma function</a>

%F psi(2/3) = -gamma+Pi*sqrt(3)/6-3*log(3)/2 = A093602 - A047787 = 1.813799 -3.132033...

%e psi(2/3) = -1.3182344157865884724023408166...

%t RealDigits[ -PolyGamma[2/3], 10, 98] // First (* _Jean-François Alcover_, Feb 20 2013 *)

%o (PARI) -psi(2/3) \\ _Charles R Greathouse IV_, Nov 22 2011

%Y Cf. A020759, A047787, A020777

%K cons,nonn

%O 1,2

%A _R. J. Mathar_, Nov 13 2011

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Last modified March 28 16:58 EDT 2024. Contains 371254 sequences. (Running on oeis4.)