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 A268683 Decimal expansion of (sqrt(2) - 1)/2. 4
 2, 0, 7, 1, 0, 6, 7, 8, 1, 1, 8, 6, 5, 4, 7, 5, 2, 4, 4, 0, 0, 8, 4, 4, 3, 6, 2, 1, 0, 4, 8, 4, 9, 0, 3, 9, 2, 8, 4, 8, 3, 5, 9, 3, 7, 6, 8, 8, 4, 7, 4, 0, 3, 6, 5, 8, 8, 3, 3, 9, 8, 6, 8, 9, 9, 5, 3, 6, 6, 2, 3, 9, 2, 3, 1, 0, 5, 3, 5, 1, 9, 4, 2, 5, 1, 9, 3 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS This is the maximum increase in mass-energy a particle can carry away from a neutral rotating (Kerr) black hole via the Penrose process. Apart from leading digits the same as A174968, A157214 and A010503. - R. J. Mathar, Feb 24 2016 REFERENCES Subrahmanyan Chandrasekhar, The Mathematical Theory of Black Holes, Oxford (1983), pp. 368-369. LINKS G. C. Greubel, Table of n, a(n) for n = 0..10000 Stijn J. van Tongeren, Rotating black holes (2009). Wikipedia, Penrose process EXAMPLE 0.20710678118654752440084436210484903928483593768847403658833986899536623... MATHEMATICA RealDigits[(Sqrt[2] - 1) / 2, 10, 90] [[1]] (* Vincenzo Librandi, Feb 20 2016 *) PROG (PARI) (sqrt(2)-1)/2 (Magma) (Sqrt(2)-1)/2 // Vincenzo Librandi, Feb 20 2016 CROSSREFS Cf. A268682, A174968. Sequence in context: A022897 A192496 A156442 * A174968 A254445 A346670 Adjacent sequences: A268680 A268681 A268682 * A268684 A268685 A268686 KEYWORD nonn,cons,easy AUTHOR Charles R Greathouse IV, Feb 19 2016 EXTENSIONS More digits from Jon E. Schoenfield, Mar 15 2018 STATUS approved

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Last modified December 8 23:37 EST 2023. Contains 367681 sequences. (Running on oeis4.)