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 A248176 Decimal expansion of psi(-1/2). 2
 3, 6, 4, 8, 9, 9, 7, 3, 9, 7, 8, 5, 7, 6, 5, 2, 0, 5, 5, 9, 0, 2, 3, 6, 6, 7, 0, 0, 1, 2, 4, 4, 4, 3, 2, 8, 0, 6, 8, 4, 0, 3, 9, 5, 3, 3, 9, 5, 6, 5, 8, 9, 2, 9, 5, 2, 8, 7, 2, 7, 4, 6, 1, 2, 8, 3, 4, 5, 0, 2, 9, 2, 8, 2, 9, 4, 5, 8, 9, 7, 8, 5, 1, 3, 2, 6, 2, 8, 2, 7, 1, 5, 4, 1, 5, 8, 7, 5, 4, 0, 1, 3, 6, 5, 5, 9, 0 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET -1,1 COMMENTS Psi denotes the digamma function. LINKS Stanislav Sykora, Table of n, a(n) for n = -1..2000 Wikipedia, Digamma function FORMULA Since psi(1 + x) = psi(x) + 1/x, equals 2 + psi(1/2) = 2 - 2*log(2)-EulerGamma = 2 - A020759. Equals PolyGamma(3/2). - Peter Luschny, Apr 14 2020 EXAMPLE 0.0364899739785765205590236670012444328068403953395658929528727461... MATHEMATICA RealDigits[2 - (EulerGamma + 2Log[2]), 10, 100][[1]] (* Alonso del Arte, Oct 03 2014 *) PROG (PARI) psi(-1/2) (MAGMA) SetDefaultRealField(RealField(100)); R:= RealField(); 2 - (2*Log(2) + EulerGamma(R)); // G. C. Greubel, Aug 30 2018 CROSSREFS Cf. A001620, A002162, A020759. Sequence in context: A004546 A197255 A154890 * A100000 A083682 A021278 Adjacent sequences:  A248173 A248174 A248175 * A248177 A248178 A248179 KEYWORD nonn,cons,easy AUTHOR Stanislav Sykora, Oct 03 2014 STATUS approved

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Last modified August 8 02:22 EDT 2020. Contains 336290 sequences. (Running on oeis4.)