

A178647


Decimal expansion of the fraction of a population falling within + 1 standard deviation of the mean, assuming a normal distribution.


3



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
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OFFSET

0,1


LINKS

Rick L. Shepherd, Table of n, a(n) for n = 0..10000
Eric Weisstein's World of Mathematics, Erf
Wikipedia, 689599.7 rule


FORMULA

erf(1/sqrt(2)).  JeanFrançois Alcover, May 29 2013


EXAMPLE

0.6826894921370858971704650912640758449558259334532087819747889004859...


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



