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A091723 Decimal expansion of the root x of Ei(x)=0, where Ei is the exponential integral. 3
3, 7, 2, 5, 0, 7, 4, 1, 0, 7, 8, 1, 3, 6, 6, 6, 3, 4, 4, 6, 1, 9, 9, 1, 8, 6, 6, 5, 8, 0, 1, 1, 9, 1, 3, 3, 5, 3, 5, 6, 8, 9, 4, 9, 7, 7, 7, 1, 6, 5, 4, 0, 5, 1, 5, 5, 5, 6, 5, 7, 4, 3, 5, 2, 4, 2, 2, 0, 0, 1, 2, 0, 6, 3, 6, 2, 0, 1, 8, 5, 4, 3, 8, 4, 9, 2, 6, 0, 4, 9, 9, 5, 1, 5, 4, 8, 9, 4, 2, 3, 9, 2 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Robert Price, Table of n, a(n) for n = 0..10000

Eric Weisstein's World of Mathematics, Exponential Integral

EXAMPLE

0.372507410781366634461991866580119133535689497771654...

MATHEMATICA

RealDigits[ x /. FindRoot[ ExpIntegralEi[x] == 0, {x, 1}, WorkingPrecision -> 102]][[1]] (* Jean-François Alcover, Oct 29 2012 *)

PROG

(PARI) solve(x=.3, 1, real(eint1(-x))) \\ Charles R Greathouse IV, Apr 14 2014

CROSSREFS

Sequence in context: A090688 A064824 A226521 * A274509 A016618 A130789

Adjacent sequences:  A091720 A091721 A091722 * A091724 A091725 A091726

KEYWORD

nonn,cons

AUTHOR

Eric W. Weisstein, Feb 01 2004

STATUS

approved

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Last modified December 7 23:55 EST 2016. Contains 278902 sequences.