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 A178647 Decimal expansion of the fraction of a population falling within +- 1 standard deviation of the mean, assuming a normal distribution. 4
 6, 8, 2, 6, 8, 9, 4, 9, 2, 1, 3, 7, 0, 8, 5, 8, 9, 7, 1, 7, 0, 4, 6, 5, 0, 9, 1, 2, 6, 4, 0, 7, 5, 8, 4, 4, 9, 5, 5, 8, 2, 5, 9, 3, 3, 4, 5, 3, 2, 0, 8, 7, 8, 1, 9, 7, 4, 7, 8, 8, 9, 0, 0, 4, 8, 5, 9, 8, 2, 8, 8, 3, 9, 7, 4, 4, 0, 9, 6, 5, 9, 0, 0, 1, 7, 6, 9, 8, 3, 6, 8, 1, 1, 2, 7, 8, 6, 5, 5, 0, 5, 6, 5, 4, 5 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Rick L. Shepherd, Table of n, a(n) for n = 0..10000 Eric Weisstein's World of Mathematics, Erf Wikipedia, 68-95-99.7 rule FORMULA erf(1/sqrt(2)). - Jean-François Alcover, May 29 2013 EXAMPLE 0.6826894921370858971704650912640758449558259334532087819747889004859... MAPLE erf(1/sqrt(2)) ; evalf(%) ; # R. J. Mathar, Mar 22 2016 MATHEMATICA RealDigits[(1 + Erf[1/Sqrt@2])/2 - (1 + Erf[ -1/Sqrt@2])/2, 10, 111][[1]] (* Robert G. Wilson v, Jun 01 2010 *) PROG (MATLAB) 0.5*(1+erf(1/sqrt(2)))- 0.5*(1+erf(-1/sqrt(2))) (PARI) (erfc(-1/sqrt(2))-erfc(1/sqrt(2)))/2 \\ Charles R Greathouse IV, Sep 04 2012 (PARI) 1 - erfc(1/sqrt(2)) \\ Rick L. Shepherd, Mar 05 2014 CROSSREFS Cf. A110894. Sequence in context: A263719 A154564 A152914 * A093204 A054512 A197267 Adjacent sequences:  A178644 A178645 A178646 * A178648 A178649 A178650 KEYWORD nonn,cons AUTHOR Joost de Winter, May 31 2010 EXTENSIONS More terms from Robert G. Wilson v, Jun 01 2010 Edited by N. J. A. Sloane, Jun 07 2010 STATUS approved

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