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A200064 Decimal expansion of the negated value of the digamma function at 2/3. 5
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, 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, 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 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..98.

Wikipedia, Digamma function

FORMULA

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

EXAMPLE

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

MATHEMATICA

RealDigits[ -PolyGamma[2/3], 10, 98] // First (* Jean-Fran├žois Alcover, Feb 20 2013 *)

PROG

(PARI) -psi(2/3) \\ Charles R Greathouse IV, Nov 22 2011

CROSSREFS

Cf. A020759, A047787, A020777

Sequence in context: A112420 A010288 A143291 * A242072 A248584 A077111

Adjacent sequences:  A200061 A200062 A200063 * A200065 A200066 A200067

KEYWORD

cons,nonn

AUTHOR

R. J. Mathar, Nov 13 2011

STATUS

approved

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Last modified December 20 19:29 EST 2014. Contains 252289 sequences.