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 A208899 Decimal expansion of sqrt(5)/3 . 3
 7, 4, 5, 3, 5, 5, 9, 9, 2, 4, 9, 9, 9, 2, 9, 8, 9, 8, 8, 0, 3, 0, 5, 7, 8, 8, 9, 5, 7, 7, 0, 9, 2, 0, 7, 8, 4, 8, 0, 2, 0, 6, 1, 1, 9, 8, 7, 0, 5, 0, 8, 5, 7, 4, 7, 5, 6, 9, 6, 5, 7, 4, 8, 4, 7, 0, 1, 7, 3, 6, 4, 1, 8, 7, 9, 2, 6, 8, 2, 9, 9, 8, 0, 4, 8, 0, 4, 8, 0, 2, 7, 9, 2, 9, 2, 7, 4, 2, 4, 9 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Equals the absolute value of the cosine of the dihedral angle between two adjacent faces of the regular icosahedron. LINKS Ivan Panchenko, Table of n, a(n) for n = 0..1000 Wikipedia, Exsphere FORMULA Equals A002163/3 = 20*A020837/3. Equals Sum_{k>=0} (-1)^k * binomial(2*k,k)/5^k. - Amiram Eldar, Aug 03 2020 EXAMPLE 0.7453559924... MATHEMATICA RealDigits[Sqrt[5]/3, 10, 120][[1]] (* Harvey P. Dale, Jul 03 2013 *) CROSSREFS Cf. A002163, A020837. Sequence in context: A011475 A180078 A019685 * A087491 A019899 A085662 Adjacent sequences:  A208896 A208897 A208898 * A208900 A208901 A208902 KEYWORD nonn,cons,easy AUTHOR R. J. Mathar, Mar 03 2012 STATUS approved

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Last modified September 22 18:56 EDT 2021. Contains 347608 sequences. (Running on oeis4.)