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 A257535 Decimal expansion of the imaginary part of -E_1(i), i being the imaginary unit. 3
 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 (list; constant; graph; refs; listen; history; text; internal format)
 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)) and (Pi/2) - A099281. EXAMPLE 0.6247132564277136042899683778165717842862467449494411200160175... PROG (PARI) a = imag(-eint1(I)) CROSSREFS Cf. A099281, A099282, A099285. Sequence in context: A061496 A125115 A202244 * A020831 A298777 A156590 Adjacent sequences:  A257532 A257533 A257534 * A257536 A257537 A257538 KEYWORD nonn,cons AUTHOR Stanislav Sykora, Apr 28 2015 STATUS approved

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Last modified August 14 17:44 EDT 2018. Contains 313751 sequences. (Running on oeis4.)