A257535 - OEIS

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A257535

Decimal expansion of the imaginary part of -E_1(i), i being the imaginary unit.

6, 2, 4, 7, 1, 3, 2, 5, 6, 4, 2, 7, 7, 1, 3, 6, 0, 4, 2, 8, 9, 9, 6, 8, 3, 7, 7, 8, 1, 6, 5, 7, 1, 7, 8, 4, 2, 8, 6, 2, 4, 6, 7, 4, 4, 9, 4, 9, 4, 4, 1, 1, 2, 0, 0, 1, 6, 0, 1, 7, 5, 2, 2, 5, 8, 7, 2, 2, 1, 1, 6, 6, 6, 0, 2, 3, 0, 6, 5, 8, 1, 2, 2, 5, 3, 1, 5, 2, 7, 9, 5, 8, 9, 3, 1, 7, 8, 2, 2, 7, 7, 6, 0, 5, 0

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OFFSET

0,1

COMMENTS

E_1(z) = Integral_{t>=1}(exp(-t*z)/t) is the exponential integral.

LINKS

Stanislav Sykora, Table of n, a(n) for n = 0..2000

Wikipedia, Exponential integral.

FORMULA

Equals imag(E_1(-i)).

Equals (Pi/2) - A099281.

EXAMPLE