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 A102912 Decimal expansion of a close approximation to the Ramanujan constant. 5
 2, 6, 2, 5, 3, 7, 4, 1, 2, 6, 4, 0, 7, 6, 8, 7, 4, 3, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 2, 5, 1, 1, 2, 3, 8, 7, 5, 9, 3, 6, 7, 9, 9, 8, 0, 0, 9, 5, 4, 4, 1, 7, 3, 6, 7, 9, 1, 0, 2, 2, 7, 7, 1, 6, 6, 3, 5, 3, 5, 7, 0, 9, 1, 7, 6, 1, 3, 7, 3, 3, 3, 4, 1, 0, 0, 6, 2, 8, 1, 0, 4, 9, 2, 7, 6, 5, 1, 0, 4, 2, 4, 8, 7 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 18,1 COMMENTS First differs from Ramanujan's constant (A060295) at a(33). - Omar E. Pol, Jun 26 2012 Kontsevich & Zagier give also exp(3*log(640320)) = 2.62537412640768000... as a close approximation to the Ramanujan constant. - Jean-François Alcover, Jun 22 2015 LINKS G. C. Greubel, Table of n, a(n) for n = 18..10000 M. Kontsevich and D. Zagier, Periods, Institut des Hautes Etudes Scientifiques 2001 IHES/M/01/22 Eric Weisstein's World of Mathematics, Ramanujan Constant FORMULA Equals: Real root of x^3 - 6*x^2 + 4*x - 2 = 0, being x_{real} = (6 + (3*(45 + sqrt(489)))^(1/3) + (3*(45 - sqrt(489)))^(1/3))/3 = 5.31863, evaluated as (x_{real})^24 - 24. - G. C. Greubel, Feb 15 2018 EXAMPLE 262537412640768743.999999999999251123875936799800954417367910227716... MATHEMATICA RealDigits[ Root[ #^3 - 6#^2 + 4# - 2 &, 1]^24 - 24, 10, 111][[1]] CROSSREFS Cf. A060295. Sequence in context: A221188 A220532 A060295 * A064850 A151853 A268766 Adjacent sequences:  A102909 A102910 A102911 * A102913 A102914 A102915 KEYWORD cons,nonn AUTHOR Eric W. Weisstein, Jan 17 2005 STATUS approved

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Last modified February 18 09:15 EST 2020. Contains 332011 sequences. (Running on oeis4.)