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 A217708 Decimal expansion of integral_{0, Pi/4} log(sin(x))^3 dx. 0
 6, 0, 3, 7, 5, 8, 1, 1, 0, 6, 3, 0, 9, 5, 9, 8, 1, 7, 0, 2, 6, 7, 4, 3, 6, 8, 9, 2, 6, 5, 0, 2, 6, 7, 4, 6, 7, 5, 5, 0, 3, 9, 8, 2, 8, 5, 8, 8, 8, 6, 8, 6, 2, 7, 1, 7, 5, 1, 8, 0, 4, 9, 0, 1, 3, 5, 5, 8, 7, 4, 2, 2, 1, 2, 7, 0, 1, 6, 0, 6, 7, 4, 0, 9, 7, 6, 9, 3, 5, 9, 7, 6, 6, 7, 5, 9, 9, 6, 8, 2 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Curiously, this integral from 0 to Pi/4 is far more difficult to evaluate by hand than the same integral from 0 to Pi/2. LINKS Table of n, a(n) for n=1..100. EXAMPLE -6.037581106... MATHEMATICA (1/8)*((-Log[2]^2)*(Pi*Log[2] + 3*Catalan) - 4*Sqrt[2]*(6*HypergeometricPFQ[{1/2, 1/2, 1/2, 1/2, 1/2}, {3/2, 3/2, 3/2, 3/2}, 1/2] + HypergeometricPFQ[{1/2, 1/2, 1/2, 1/2}, {3/2, 3/2, 3/2}, 1/2]*Log[8])) // RealDigits[#, 10, 100] & // First RealDigits[Integrate[Log[Sin[x]]^3, {x, 0, Pi/4}], 10, 120][[1]] (* Harvey P. Dale, Jun 08 2021 *) CROSSREFS Cf. A196878 (the same integral from 0 to Pi/2) Sequence in context: A038139 A021998 A289487 * A306243 A173685 A019108 Adjacent sequences: A217705 A217706 A217707 * A217709 A217710 A217711 KEYWORD nonn,cons AUTHOR Jean-François Alcover, Mar 20 2013 STATUS approved

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Last modified May 19 11:18 EDT 2024. Contains 372683 sequences. (Running on oeis4.)